Americium

Chaitra 26/06/2026 19:58:09 Updated 26/06/2026 19:58:09

Property	Value
Atomic Number	95
Element	Americium
Symbol	Am
Atomic Mass	[243] (most stable isotope)
Number of Neutrons	148 (Americium-243)
Number of Protons	95
Number of Electrons	95
Period	7
Group	Actinide (no fixed group number)
Phase	Solid
Radioactive	Yes
Natural	No (synthetic element)
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Actinide
Atomic Radius	~173 pm (estimated)
Electronegativity	1.13 (estimated)
First Ionization Energy	5.973 eV (estimated)
Density	13.69 g/cm³
Melting Point	1176 °C
Boiling Point	2607 °C
Number of Isotopes	No stable isotopes (Am-241, Am-243 most notable)
Discoverer	Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso
Year	1944
Specific Heat	0.100 J/g·K (estimated)
Number of Shells	7
Number of Valence Electrons	7