Recognised as Chemical element
Terbium
- Tb
- Z = 65
- lanthanide
Terbium (Tb) is element 65, a lanthanide in period 6. Its standard atomic weight is 158.93 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolTb
Standard atomic weight158.93atomic mass units (Da)
Mass in kilograms2.6390947 × 10^-25
Categorylanthanide
GroupLanthanide/actinide series, with no group number
Period6
Blockf-block
Electrons in a neutral atom65
Neutrons in the most common isotope94≈
Electron configuration
Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f⁹ 5s² 5p⁶ 6s²ground state, subshells written in order of n
Noble gas shorthand[Xe] 4f⁹ 6s²
Electrons per shell2, 8, 18, 27, 8, 2K, L, M and outward
Electrons in the outer shell2
Unpaired electrons5Hund's rule; unpaired electrons make the free atom paramagnetic
Madelung ruleFollowedthe ground state is what the n + l filling order predicts
Quantities
Molar mass158.93 g/mol
Mass of one mole158.93 grams
Atoms in one gram3.7891781 × 10^21
Mass of one atom2.6390947 × 10^-22 g
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