Symbol	Am
Atomic number	95
Group	-
Period	7
Block	f
Classification	Actinide

Appearance	Silvery white
Color	Silver

Number of protons	95 p+
Number of neutrons	148 n0
Number of electrons	95 e-

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.

Phase at STP	Solid
Density	12 g/cm3
Atomic weight	243 u

Melting point	1449 K 1175.85 °C 2148.53 °F
Boiling point	2880 K 2606.85 °C 4724.33 °F
Heat of vaporization	-

Electronegativity (Pauling Scale)	1.13
Electron affinity	9.93 kJ/mol
Oxidation states	+2, +3, +4, +5, +6, +7 (an amphoteric oxide)
Ionization energies	578 kJ/mol 1158 kJ/mol 2132 kJ/mol 3493 kJ/mol

Electron configuration Shorthand configuration	[Rn] 5f7 7s2
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f7 6s2 6p6 7s2
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f7 6s2 6p6 7s2
Electrons per shell	2, 8, 18, 32, 25, 8, 2
Valence electrons	2
Valency electrons	3,4
Bohr model	Figure: Shell diagram of Americium (Am) atom.
Orbital Diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s

Discovery

Glenn T. Seaborg, R. A. James, Leon O. Morgan, A. Ghiorso (1944)

CAS Number	7440-35-9
ChemSpider ID	22405
EC number	231-144-4
PubChem CID Number	23966