మూస:Infobox americium

అమెరీషియం, ₀₀Am

అమెరీషియం
Pronunciation	/ˌæməˈrɪsiəm/ ​(AM-ə-RISS-ee-əm)
Appearance	silvery white
అమెరీషియం in the periodic table
Group	f-block groups (no number)
Period	period 7
Block
Electrons per shell	2, 8, 18, 32, 25, 8, 2
Physical properties
Phase at STP	solid
Melting point	1449 K ​(1176 °C, ​2149 °F)
Boiling point	2880 K ​(2607 °C, ​4725 °F)
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	+2, +3, +4, +5, +6, +7 (an amphoteric oxide)
Electronegativity	Pauling scale: 1.3
Atomic radius	empirical: 173 pm
Covalent radius	180±6 pm
Other properties
Natural occurrence	synthetic
Crystal structure	​hexagonal
Thermal conductivity	10 W/(m⋅K)
Electrical resistivity	0.69 µ Ω⋅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)
Isotopes of అమెరీషియం

References

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