Chemical element
Thulium
- Tm
- Z = 69
- lanthanide
Thulium (Tm) is element 69, a lanthanide in period 6. Its standard atomic weight is 168.93 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolTm
Standard atomic weight168.93atomic mass units (Da)
Mass in kilograms2.8051486 × 10^-25
Categorylanthanide
GroupLanthanide/actinide series, with no group number
Period6
Blockf-block
Electrons in a neutral atom69
Neutrons in the most common isotope100≈
Quantities
Molar mass168.93 g/mol
Mass of one mole168.93 grams
Atoms in one gram3.5648735 × 10^21
Mass of one atom2.8051486 × 10^-22 g
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