Actinide

Americium

Americium (Am) has atomic number 95. PubChem classifies it as actinide.

Atomic number

95

Symbol

Am

Atomic weight (source value)

243.061380

Electron configuration

[Rn]7s2 5f7

Standard state

Solid

Electronegativity (Pauling)

1.3

Melting point (K)

1449

Boiling point (K)

2284

Density (g/cm³)

13.69

Oxidation states

+6, +5, +4, +3

Understanding this entry

Atomic number is the number of protons in the nucleus. Properties are reference values and may depend on conditions and measurement conventions. An atomic weight is not the mass of every isotope. For elements without a standard atomic weight, a source may report an isotope mass number. Blank source values are shown as unavailable rather than estimated.

Further reading and reference: NIH PubChem source dataset ↗. Values and educational summaries are not a substitute for specialised advice.