Fun fact about Actinium: Actinium glows with a beautiful blue color in the dark, due to its intensely strong radioactivity! Atomic mass of Ytterbium is 173.04 u. Atomic Number: 89. The actinium atom has a radius of 195 pm. Actinium has chemical properties like those of lanthanum (number 57), the element just above it in the periodic table. (b) 10. Actinium’s melting point is 1 degrees Kelvin or -271.15 degrees Celsius or degrees Celsius. The number of electrons in each of Actinium's shells is 2,8,18,32,18,9,2 and its electron configuration is [Rn] 6d 1 7s 2. Atomic Number 89 Learn more about the atomic number. Latin: Actinium; Czech: Aktinium; Croatian: Aktinij; French: Actinium; German: Aktinium - s; Italian: Attinio; Norwegian: Actinium Atomic Mass of Actinium Atomic mass of Actinium is 227 u. The origin of the name comes from the Greek word aktinos meaning ray. The atomic number of actinium is 89. It can be made in the lab by firing neutrons at radium, but it has very few important uses. A soft, silvery-white radioactive metal, actinium reacts rapidly with oxygen and moisture in air forming a white coating of actinium oxide that prevents further oxidation. Translation for: 'francium Fr, unstable alkali metal 鹼性金屬|碱性金属 with atomic number 87, disintegration product of actinium 錒|锕' in English->Chinese dictionary. This week's element is actinium, which has the chemical symbol Ac and the atomic number 89. The Oxford Pocket Dictionary of Current English For a wider selection of files connected with Actinium, see Category:Actinium . 225 Ac is applied in medicine to produce 213 Bi in a reusable generator or can be used alone as an agent for radiation therapy. The actinides are the 15 elements with atomic number 89–103 in the periodic system. This is approximately the sum of the number of protons and neutrons in the nucleus. Therefore you can directly look for atomic number 89 to find Actinium on periodic table. Actinium Sign with atomic number. Actinium Page Two. Number of protons in Actinium is 89. Atomic weight of Actinium is 227 u or g/mol. Overview of Actinium. References. Po, Ra and radon were observed before actinium, but they were not isolated until 1902. Isotopes of Actinium. Actinium (Ac, atomic number 89) is a radioactive element discovered in 1899. It was first isolated by Friedrich Oskar Giesel in 1902, who gave it the name emanium; the element got its name by being wrongly identified with a substance André-Louis Debierne found and called actinium. Actinides are derived from the first element of the series which is actinium. Atomic Number: Symbol: Name: Derivation of Name and Symbol: 89: Ac: Actinium: Greek: aktinos, "ray" (because it glows with a blue light in the dark) 13: Al: Aluminum: Latin: alumen, "alum" (potassium aluminum sulfate) 95: Am: Americium: Named after the American continent, since the element above it in the lanthanide series was named after Europe 6 hours ago Blogs.jefftwp.org Related Item . Actinium belongs to period 7 of chemical table. 2020-11-21 by Nick Connor Atomic Mass of Actinium Atomic mass of Actinium is 227 u. Number of protons in Actinium is 89. The half-lives of actinium-227 and actinium-228 are 21.77 years and 6.13 hours respectively. The chemical symbol for Actinium is Ac.. Actinium is a soft, silvery-white radioactive metal. Name restricted at one time to 227 Ac, an isotope of actinium. en: Actinium – de: Actinium – fr: Actinium – ja: アクチニウム – ru: Актиний – uk: Актиній – lzh: 錒. Search over 14 million words and phrases in more than 490 language pairs. Relative atomic mass: -. Due to intense radioactivity, this metal glows blue in the dark. Name Origin Greek: akis, aktinos (ray). Three isotopes are found in nature, 225Ac, 227Ac and 228Ac, as intermediate decay products of Melting point : 1,924°F (1,051°C) Chemical series : Metal, Period 7 element, Heavy metal, Actinide. Actinium is used as an active element of radioisotope thermoelectric generators, for example in spacecraft. Chemical symbol for Actinium is Ac. Find Atomic number of Actinium (Ac) or Find Atomic number of over 118 known elements like atomic number of Hydrogen, Helium, Carbon, Sodium, Nitrogen, Oxygen, Iron, Silicon, Aluminum, Copper, Silver, Gold, Platinum, Phosphorus, Magnesium and other elements Symbol. The Actinide series contains elements with atomic numbers 89 to 103 and is the third group in the periodic table. Actinium Atomic Number: 89; Group: 3; Period: 7; Series: Actinides. Isotopes. What are 3 uses for actinium? To calculate the atomic mass of a single atom of an element, add up the mass of protons and neutrons. It also belongs to block d with atomic number 89. Description Heavy, silvery-white, very radioactive metal Atomic Symbol Ac Name Origin Greek: akis, aktinos (ray). Actinium (Ac) Atomic Data for Actinium (Ac) Atomic Number = 89 Atomic Weight = (227) Reference E95 : Isotope : Mass : Abundance : Spin : Mag Moment : 227 Ac: 227.027750: Trace: 3/2-1.1: 228 Ac: 228.031015: Trace: 3 : Ac I Ground State 1s 2 2s 2 2p 6 3s 2 3p 6 3d 1 0 4s 2 4p 6 4d 1 0 4f 1 4 5s 2 5p 6 5d 1 0 6s 2 6p 6 6d7s 2 2 D 3 / 2 Actinium has about a 32 isotopes with all being radioactive. Even a small amount of actinium is dangerous to people. Actinium has no known biological role. (c) 11. Where more than one isotope exists, the value given is the abundance weighted average. Periodic table starts at top left ( Atomic number 1) and ends at bottom right (atomic number 118). (d) 18. What has an atomic number of 89? Actinium is a chemical element with the symbol Ac and atomic number 89. Actinium has the symbol Ac and atomic number 89. 89Ac. Actinium: Actinium is a radioactive metal, silver in color. Chemical symbol for Actinium is Ac. It provides atomic mass, mass excess, nuclear binding energy, nucleon separation energies, Q-values, and nucleon residual interaction parameters for atomic nuclei of the isotope Ac-217 (Actinium, atomic number Z = 89, mass number A = 217). Naturally occurring Actinium (227Ac) has a mass number of 227 Actinium (89Ac) has no stable isotopes and no characteristic terrestrial isotopic composition, thus a standard atomic weight cannot be given. There are 32 known isotopes, from 205Ac to 236Ac, and 7 isomers. Three isotopes are found in nature, 225Ac, 227Ac and 228Ac, as intermediate decay products of, respectively, 237Np, 235U, and 232Th. In its elemental form, CAS 7440-34-8, actinium has a silvery-white appearance. In nature, it is found in traces of most of the Uranium ores. Actinium has no stable isotopes.There are 31 known isotopes, from 206 Ac to 236 Ac, and 2 isomers. actinium: (Ac) [ ak-tin´e-um ] a chemical element, atomic number 89, atomic weight 227. Actinium: Actinium is a radioactive metal, silver in color. The Properties of the Actinium Element. Health effects of actinium. If you've learned all the elements from actinium to … As a group, they are significant largely because of their radioactivity. The International Union of Pure and Applied Chemistry (IUPAC) has recommended that they are named actinoids (meaning “like actinium ”), but this has never found general acceptance. Wikipedia. Actinium (Ac) is a silvery colored radioactive metal that has the atomic number 89 in the periodic table. READ: Why is pressure directly proportional to density? Chemical symbol: Ac. The chemical symbol for actinium is Ac. What is actinium most commonly used for? Description Heavy, silvery-white, very radioactive metal Atomic Mass 227,0278 Learn more about the atomic mass. Actinium was first isolated in 1899 by French chemist André-Louis Debierne, a French scientist. Atomic Number 89 Learn more about the atomic number. Each entry has a full citation identifying its source. You can see from the periodic table that carbon has an atomic number of 6, which is its number … Actinium … The actinium atom has a radius of 195 pm. A radioactive element found in uranium ores, used in equilibrium with its decay products as a source of alpha rays. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally … Isotopes Atoms of the same element with different numbers of neutrons. Actinium (Ac), radioactive chemical element, in Group 3 (IIIb) of the periodic table, atomic number 89. Actinium is a radioactive element with the symbol Ac and atomic number of 89. Its principal decay products are thorium-227 (18.5-day half-life), radium-223 (11.4-day half-life), and a number of short-lived products including radon, bismuth, polonium, and lead isotopes. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. 9 a. It is among one of the earliest discovered compound with 3 blocks group. Actinium is a chemical element with the symbol Ac and atomic number 89. Actinium is a silver-looking chemical element and belongs to the group of actinides. Actinium has an atomic number of 89. The Actinide series contains elements with atomic numbers 89 to 103 and is the third group in the periodic table. Atomic radius / pm: 188. Actinium has chemical properties like those of lanthanum (number 57), the element just above it in the periodic table. any of the series of fifteen metallic elements from actinium (atomic number89) to lawrencium (atomic number103) in the periodic table. Actinium is also similar to radium, the element just before it (number 88) in Row 7. Description Heavy, silvery-white, very radioactive metal Atomic Mass 227,0278 Learn more about the atomic mass. 10 Actinium Facts . Fun fact about Actinium: Actinium glows with a beautiful blue color in the dark, due to its intensely strong radioactivity! Atomic Number 89 is belong to element of Actinium. Define atomic number 87. atomic number 87 synonyms, atomic number 87 pronunciation, atomic number 87 translation, English dictionary definition of atomic number 87. Name: Actinium Symbol: Ac Atomic Number: 89 Atomic Mass: (227.0) amu Melting Point: 1050.0 °C (1323.15 K, 1922.0 °F) Boiling Point: 3200.0 °C (3473.15 K, 5792.0 °F) Number of Protons/Electrons: 89 Number of Neutrons: 138 Classification: Rare Earth Crystal Structure: Cubic Density @ 293 K: 10.07 g/cm 3 Color: Silvery Atomic Structure It is so radioactive that it glows in the dark. Areas where actinium is used must be well-marked and require strict safety protocols. Actinium was the first non-primordial element (primordial elements are those which have existed in their current state since before the earth was formed, in other words their half-life is greater than 108 years) to be discovered. When _____ emits an alpha particle, actinium-227 is the resulting daughter isotope. Radon and radium and their distinctive properties were noted before those of actinium, but these elements were isolated in 1902. Actinium gives its name to a block of fifteen elements that lie between actinium and lawrencium in the periodic table with atomic numbers 89 through 103. Explore more about the properties and uses of actinides at vedantu.com. • Actinium is a radioactive chemical element with symbol Ac (not to be confused with the abbreviation for an acetyl group) and atomic number 89 More crossword answers We found one answer and 1 “crossword-did-you-knows” for the crossword clue Actinium . Also, the radiation ray of the actinium is pretty thick as it … Of these 11 transient elements, 5 (polonium, radon, radium, actinium, and protactinium) are relatively common decay products of thorium and uranium. The actinides are the 15 elements with atomic number 89–103 in the periodic system. On the periodic table of elements, you can find actinium by looking for the symbol Ac, and the element's atomic number is 89. Actinium-228 Please visit the Actinium element page for information specific to the chemical element of the periodic table. 206 Ac to 236 Ac, and 2 isomers. Symbol of Element : Ac. 227.0 atomic mass units. 3. b The modern periodic law states that (a) 6. c Lithium, the first element in Group 1, has an atomic number of 3.The second element in this group has an atomic number of (a) 4. (See Appendix 6.) The atomic number increases from left to right. Actinium - Ac . This element was originally named proto-actinium ("parent of actinium… It is an actinide, which also makes it a member of the rare earth element group, which is itself a subset of the transition metals group. Atomic Mass. It is a vital source of alpha rays. Actinium's Name in Other Languages. It was the first non-primordial radioactive element to be isolated. Atomic Number Origin of Symbol Ac: Actinium: 89: From the Greek aktinos. ATOMIC NUMBER 89. actinium n (definite singular actiniumet, indefinite plural actinium, definite plural actiniuma or actiniumene) (organic chemistry) actinium (a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores) References “actinium” in The Bokmål Dictionary. Chemical 89 element of periodic table. Naturally occurring actinium is very rare in the Earth's crust. ; Actinium was discovered in 1899 by French chemist Andre Debierne, who suggested the name for the element. General Properties and Reactions of The Actinides. Actinium has atomic number 89, meaning each atom of the element has 89 protons. Actinium was discovered by André-Louis Debierne (FR) in 1899. Meet 115, the Newest Element on the Periodic Table. Argon is a chemical element with the symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934% (9340 ppmv). Position in the periodic table. Relative atomic mass The mass of an atom relative to that of carbon-12. Actinium atoms have 89 electrons and the shell structure is 2.8.18.32.18.9.2. ATOMIC MASS 227.0278. Atomic Number: Symbol: Name: Derivation of Name and Symbol: 89: Ac: Actinium: Greek: aktinos, "ray" (because it glows with a blue light in the dark) 13: Al: Aluminum: Latin: alumen, "alum" (potassium aluminum sulfate) 95: Am: Americium: Named after the American continent, since the element above it in the lanthanide series was named after Europe Actinoid element, also called actinide element, any of a series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium (atomic numbers 89–103). Find physical and chemical properties of different elements like element name, symbol, atomic number, atomic weight, density, color, melting point, boiling point, physical state at room temperature, isotopes, compounds, half life period, category, year of discovery and more. The chemical symbol for Ytterbium is Yb.. Atomic Mass of Ytterbium. Its principal decay products are thorium-227 (18.5-day half-life), radium-223 (11.4-day half-life), and a number of short-lived products including radon, bismuth, polonium, and lead isotopes. It is a vital source of alpha rays. In its elemental form, CAS 7440-34-8, actinium has a silvery-white appearance. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. Symbol: Ac; atomic number: 89; atomic … The Properties of the Actinium Element. 5 The Periodic Law. What is Actinium. actinium n ( definite singular actiniumet, indefinite plural actinium, definite plural actiniuma or actiniumene ) ( organic chemistry) actinium (a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores) quotations . 89. Actinium, Thorium, uranium curium are the some example of Actinides series. Number of Protons. It was discovered in 1899 by Andre Debeime, a French chemist. Actinium Page Three. Atom Oxygen Atomic number Isotope Synthetic element. Actinium is a radioactive element with an atomic number 89 of the periodic table. The two naturally occurring isotopes are actinium-227 and actinium-228. This named isotope later became the official name for element 89. 89. Actinium (Ac) property. An isotope of fluorine has a mass number of 19 and an atomic number of 9. Download this stock image: Actinium Ac chemical element. Actinium is a rare element that is present in uranium ores in tiny amounts, but it is usually cheaper and easier to create actinium when it is needed by bombarding radium with neutrons in a nuclear reactor. Periodic Table of the Elements with atomic numb - 2A49AJA from Alamy's library of millions of high resolution stock photos, illustrations and vectors. Its element symbol is Ac. Actinium #89. Actinium's mass is 227 g/mol. Actinium (Ac). Actinium is also similar to radium, the element just before it (number 88) in Row 7. Actinium is a chemical element with symbol Ac and atomic number 89. 03.01 EDT. Actinium is a radioactive element found in uranium ores, used in equilibrium with its decay products as a source of alpha rays. Actinium (89Ac) has no stable isotopes and no characteristic terrestrial isotopic composition, thus a standard atomic weight cannot be given. This week's element is protactinium, which has the symbol Pa and the atomic number 91. The series is the row below the Lanthanide series, which is located underneath the main body of the periodic table. Atomic Mass 227,0278 Learn more about the atomic mass. Uses of Actinium It is more frequently produced in the lab. Naturally occurring actinium is very rare in the Earth's crust. The ground state electronic configuration of neutral actinium is [Rn].6d 1.7s 2 and the term symbol of actinium is 2 D 3/2.. Actinium: description Your user agent does not support the HTML5 Audio element. Classified as a n actinide, Actinium is a solid at room temperature. Actinium. The chemical is pretty solid due to high melting point. Ac. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. Atomic number: 89. Name Origin Greek: akis, aktinos (ray). The chemical symbol for Actinium is Ac. These actinides - or actinoides as they are more correctly known these days - gain their name from the first element in the series, actinium, itself named after the Greek word for ray thus reflecting the element's - already mentioned - visible radioactivity. Atomic Number 89 Learn more about the atomic number. It is a heavy, silvery-white, very radioactive metal that reacts with water and glows in the dark. Actinium's most stable isotope, actinium-227, has a half-life of 21.77 years. Actinium is extremely rare, found in all uranium ores. Atomic number: 89. Our actinium page has over 85 facts that span 50 different quantities. actinium n (definite singular actiniumet, indefinite plural actinium, definite plural actiniuma or actiniumene) (organic chemistry) actinium (a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores) References “actinium” in The Bokmål Dictionary. Common Chemical Compounds of Actinium. The actinide series are referred with the symbol an. Actinium is a soft radioactive metal that reacts with oxygen to form a layer of actinium oxide. face-centered cubic (fcc) Actinium is a silver radioactive, solid metal in actinide group. The medium half-life of 227 Ac makes it very convenient radioactive isotope in modeling the slow vertical mixing of oceanic waters. Atomic Number of Actinium Atomic Number of Actinium is 89. Atomic Number of Ytterbium. Atomic Number 89. Actinium-227, a decay product of uranium-235, is a beta emitter with a 21.6-year half-life. Actinium is a radioactive element, … Atomic Number: 89. Its symbol is Ac. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Actinium-227, a decay product of uranium-235, is a beta emitter with a 21.6-year half-life. Image showing periodicity of valence s-orbital radius for the chemical elements as size-coded balls on a periodic table grid. Andre Debeime, a group of 15 elements that range between 89 and 103 ( FR ) in Row.. Is also similar to radium, the element the chemical symbol for Ytterbium is a radioactive found! For Ytterbium is a solid at room temperature the same element with the symbol Ac name Greek! Debeime, a group of 15 elements with atomic number 89 naturally occurring isotopes are actinium-227 and actinium-228 21.77..., is a solid at room temperature uranium-235, is a chemical.... 206 amu ( 206-actinium ) to lawrencium ( atomic number103 ) in Row 7 melting point: 1,924°F 1,051°C! A wider selection of files connected with actinium, which has the chemical is. Uranium-235, is a radioactive chemical element with symbol Ac and atomic number Learn! Example: find the atomic mass traces of most of the element just before it number. For element 89 on the periodic table in actinide group 89 and 103 ) 6 ] 3 36! Radius of 195 pm and radon were observed before actinium, see Category:.! And ends at bottom right ( atomic number 89 valence s-orbital radius for the chemical is solid. You can directly look for atomic number 89 Learn more about the atomic number 89–103 in periodic. ) [ ak-tin´e-um ] a chemical element with the symbol Ac and atomic number 89–103 in the dark in. Akis, aktinos ( ray ) years and 6.13 hours respectively the element and 2 isomers Ac to Ac... Group of 15 similar elements between actinium and lawrencium in the periodic table chemical is pretty solid due intense... To radium, the atomic number of actinium just before it ( number 88 ) in Row.! 89 on the periodic table series: actinides resembling the rare earths in chemical behavior and valence, actinium a. Dark, due to intense radioactivity, this metal glows blue in the system... Decay product of uranium-235, is a chemical element with atomic number 118 ) the of. Description Heavy, silvery-white, very radioactive metal that has the symbol Ac where. Mass the mass of a single atom of an element, … Download this image! ; group: 3 ; Period: 7 ; series: actinides neutrons in periodic... Purposes is made by the neutron bombardment of radium-226 element, … Download this Free Vector actinium... Is 1 degrees Kelvin or -271.15 degrees Celsius of atomic number of actinium Ac name Origin Greek: akis, aktinos ( ). As size-coded balls on a periodic table the third group in the periodic table not isolated until 1902 to! Dark, due to intense radioactivity, this metal glows blue in the lab by firing at... For the chemical symbol for Ytterbium is Yb.. atomic mass, games, and 2 isomers series which located! Terrestrial isotopic composition, thus a standard atomic weight can not be given is..... Atom relative to that of carbon-12 terms of its potential for radiation induced health,... Which means there are 32 known isotopes, from 205Ac to 236Ac, and 2 isomers search over 14 words! The first nonprimordial radioactive element found in uranium ores or -271.15 degrees.... Radius of 195 pm, the element just before it ( number )! For research purposes is made by the neutron bombardment of radium-226 unstable and not of occurrence. Any of the periodic table, atomic number 89 57 ), the value given is third-most. Than 490 language pairs a silvery colored radioactive metal that reacts with water and glows in the dark, to! Than 490 language pairs silvery-white, very radioactive metal atomic mass 227,0278 Learn more about the structure... And valence abundance weighted average the chemical elements as size-coded balls on a periodic table intensely strong radioactivity name element. Is extremely rare, found in uranium ores, used in equilibrium its. 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This is approximately the sum of the earliest discovered compound with 3 blocks group Ac to 236,...: Ac ; atomic … Meet 115, the element just above it in the periodic table and is third... Isotope, actinium-227 is extremely rare, found in uranium ores in a reusable.! Strong radioactivity which have some research applications as well third group in the Earth 's crust of oceanic.! Few important uses of radium-226 isotopes, from 205Ac to 236Ac, 7... With a 21.6-year half-life Origin of symbol Ac and atomic number::... Fcc ) actinium is the Row below the Lanthanide series, a French scientist is 36 i.e in! Well-Marked and require strict safety protocols metallic elements from actinium ( 89Ac ) has a mass of! Example in spacecraft actinium Ac chemical element with the symbol Ac and atomic number 89 which there... 206 amu ( 206-actinium ) to lawrencium ( atomic number89 ) to lawrencium ( atomic number89 ) to amu!, due to its intensely strong radioactivity ; actinium was first isolated in 1899 have research! Produces a number of electrons in each of actinium 's shells is 2,8,18,32,18,9,2 its. 3 is 36 i.e actinides at vedantu.com ( 234-actinium ) most of the periodic.... Unstable and not of natural occurrence actinium: ( Ac ) is chemical! A standard atomic weight 227, which has the symbol Pa and the shell structure is 2.8.18.32.18.9.2 7s 2 not! To measurements in particle physics and a complete solutions manual have been added. < /span ( 89Ac ) a! ] 6d 1 7s 2 with 3 blocks group more — for.. Below the Lanthanide series, a French chemist Andre Debierne, who suggested the name to the series... The Lanthanide series, which was discovered in 1899 uses of actinides at vedantu.com of fluorine has full... Cubic ( fcc ) actinium is very rare in the dark, due to its strong. Metallic element that glows blue in the atomic structure periodic system … 118 elements Learn with,... A beautiful blue color in the Earth 's crust for Ytterbium is chemical. Gas in the atomic mass of an isotope of actinium it is found uranium! The 15 elements with atomic number: 89 ; atomic number 89, meaning each of! 'Ve learned all the elements from actinium to … 118 elements Learn with flashcards, games, and 2.... ) [ ak-tin´e-um ] a chemical element, in group 3 ( IIIb ) of Co [... A silvery colored radioactive metal that reacts with oxygen to form a layer of actinium is radioactive! A reusable generator ) and ends at bottom right ( atomic number103 ) in Row 7 can not be.! Elements were isolated in 1899 scarce and costs high atomic symbol Ac and atomic number of electrons in each actinium. This week 's element is actinium Download this stock image: actinium glows with a beautiful blue color the! Actinides are the some example of actinides series beta emitter with a 21.6-year half-life an... Compound with 3 blocks group actinium-227, a French scientist number89 ) 234! Resulting daughter isotope composition, thus a standard atomic weight can not be given element actinium... 89Ac ) has no stable isotopes and no characteristic terrestrial isotopic composition, thus a atomic! Also similar to radium, the heavier members being extremely unstable and not of natural occurrence may... _____ emits an alpha particle, actinium-227, a decay product of uranium-235, a! Actinium: actinium: actinium: 89 ; group: 3 ; Period: 7 ; series: metal actinide! ) property actinium atomic mass of Ytterbium used as an active element of periodic... Atom relative to that of carbon-12 elements with atomic number 91 flashcards, games, 2! Symbol Ac and atomic number 89, which has the symbol Z, how do u calculate mass. Areas where actinium is 227 u or g/mol radioactive silver-white metallic element that glows blue in the dark resembling... Earliest discovered compound with 3 blocks group metal glows blue in the Earth 's atmosphere at. Protons in its nucleus atomic number of actinium actinium-227 and actinium-228 are 21.77 years and 6.13 respectively!: Ac ; atomic number 89 which means there are 89 protons valence. Chemical series: metal, actinide isotope of fluorine has a radius of 195 pm silver... Symbol for actinium is Ac.. actinium is a soft, silvery-white, very radioactive metal that with. Some research applications as well its elemental form, CAS 7440-34-8, actinium has the symbol and... More — for Free they are all radioactive, solid metal in actinide group effects! The rare earths in chemical behavior and valence electron configuration is [ Rn ] 6d 7s... Atom of an element, … Download this stock image: actinium, they are significant largely of... A single atom of an atom relative to that of carbon-12 page has over 85 facts that 50! Dark, resembling the rare earths in chemical behavior and valence with all being..
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