Chemical element
Einsteinium
- Es
- Z = 99
- actinide
- No stable isotope
Einsteinium (Es) is element 99, a actinide in period 7. Its most stable isotope has mass number 252. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolEs
Mass number of the most stable isotope252this element has no stable isotope
Mass in kilograms4.1845584 × 10^-25
Categoryactinide
GroupLanthanide/actinide series, with no group number
Period7
Blockf-block
Electrons in a neutral atom99
Neutrons in the most common isotope153≈
Quantities
Molar mass252 g/mol
Mass of one mole252 grams
Atoms in one gram2.3897384 × 10^21
Mass of one atom4.1845584 × 10^-22 g
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