Recognised as Chemical element
Holmium
- Ho
- Z = 67
- lanthanide
Holmium (Ho) is element 67, a lanthanide in period 6. Its standard atomic weight is 164.93 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolHo
Standard atomic weight164.93atomic mass units (Da)
Mass in kilograms2.7387271 × 10^-25
Categorylanthanide
GroupLanthanide/actinide series, with no group number
Period6
Blockf-block
Electrons in a neutral atom67
Neutrons in the most common isotope98≈
Electron configuration
Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹¹ 5s² 5p⁶ 6s²ground state, subshells written in order of n
Noble gas shorthand[Xe] 4f¹¹ 6s²
Electrons per shell2, 8, 18, 29, 8, 2K, L, M and outward
Electrons in the outer shell2
Unpaired electrons3Hund's rule; unpaired electrons make the free atom paramagnetic
Madelung ruleFollowedthe ground state is what the n + l filling order predicts
Quantities
Molar mass164.93 g/mol
Mass of one mole164.93 grams
Atoms in one gram3.6513313 × 10^21
Mass of one atom2.7387271 × 10^-22 g
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