Chemical element
Erbium
- Er
- Z = 68
- lanthanide
Erbium (Er) is element 68, a lanthanide in period 6. Its standard atomic weight is 167.26 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolEr
Standard atomic weight167.26atomic mass units (Da)
Mass in kilograms2.7774176 × 10^-25
Categorylanthanide
GroupLanthanide/actinide series, with no group number
Period6
Blockf-block
Electrons in a neutral atom68
Neutrons in the most common isotope99≈
Quantities
Molar mass167.26 g/mol
Mass of one mole167.26 grams
Atoms in one gram3.6004668 × 10^21
Mass of one atom2.7774176 × 10^-22 g
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