Template:Infobox americium

Americium,  ₉₅Am

Spectral lines of americium
General properties
Name, symbol	americium, Am
Appearance	silvery white
Pronunciation	/ˌæməˈrɪsiəm/ AM-ə-RIS-ee-əm
Americium in the periodic table
Eu ↑ Am ↓ (Uqs) plutonium ← americium → curium
Atomic number (Z)	95
Group, block	group n/a, f-block
Period	period 7
Element category	actinide
Standard atomic weight (Ar)	(243)
Electron configuration	[Rn] 5f7 7s2
per shell	2, 8, 18, 32, 25, 8, 2
Physical properties
Phase	solid
Melting point	1449 K ​(1176 °C, ​2149 °F)
Boiling point	2880 K ​(2607 °C, ​4725 °F) (calculated)
Density near r.t.	12 g/cm3
Heat of fusion	14.39 kJ/mol
Molar heat capacity	62.7 J/(mol·K)
vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1239 1356
Atomic properties
Oxidation states	8, 7, 6, 5, 4, 3, 2 ​(an amphoteric oxide)
Electronegativity	Pauling scale: 1.3
Ionization energies	1st: 578 kJ/mol
Atomic radius	empirical: 173 pm
Covalent radius	180±6 pm
Miscellanea
Crystal structure	​double hexagonal close-packed (dhcp)
Thermal conductivity	10 W/(m·K)
Electrical resistivity	0.69 µΩ·m
Magnetic ordering	paramagnetic
CAS Number	7440-35-9
History
Naming	after the Americas
Discovery	Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso (1944)
Most stable isotopes of americium
iso NA half-life DM DE (MeV) DP 241Am syn 432.2 y SF – – α 5.486 237Np 242mAm syn 141 y IT 0.049 242Am α 5.637 238Np SF – – 243Am syn 7370 y SF – – α 5.275 239Np

References

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