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Americium (Am)

From Wikipedia, the free encyclopediaAmericium is a radioactive transuranic chemical element with symbol Am and atomic number 95. This member of the actinide series is located in the periodic table under the lanthanide element europium, and thus by analogy was named after the Americas. Americium was first produced in 1944 by the group of Glenn T.Seaborg from Berkeley, California, at the metallurgical laboratory of University of Chicago.

Americium in the periodic table

SymbolAm
Atomic number95
Group0
Period7
Blockf
Element categoryActinide

Physical properties

Phase at STPSolid
Density12 g/cm3
Atomic weight243 u
Melting point1449 K
1175.85 °C
2148.53 °F
Boiling point2880 K
2606.85 °C
4724.33 °F

Atomic properties

Electronegativity (Pauling Scale)1.13
Electron affinity9.93 kJ/mol
Oxidation states+2, +3, +4, +5, +6, +7
(an amphoteric oxide)
Ionization energies
1578 kJ/mol
21158 kJ/mol
32132 kJ/mol
43493 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Rn] 5f7 7s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f7 6s2 6p6 7s2
Electrons per shell2, 8, 18, 32, 25, 8, 2

History

Discovered1944
Discovered byGlenn T. Seaborg
R. A. James
Leon O. Morgan
A. Ghiorso
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