Chemical element
Americium
- Am
- Z = 95
- actinide
- No stable isotope
Americium (Am) is element 95, a actinide in period 7. Its most stable isotope has mass number 243. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolAm
Mass number of the most stable isotope243this element has no stable isotope
Mass in kilograms4.0351099 × 10^-25
Categoryactinide
GroupLanthanide/actinide series, with no group number
Period7
Blockf-block
Electrons in a neutral atom95
Neutrons in the most common isotope148≈
Quantities
Molar mass243 g/mol
Mass of one mole243 grams
Atoms in one gram2.4782472 × 10^21
Mass of one atom4.0351099 × 10^-22 g
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