Holmium

Lanthanide · 164.93033 u · group 3, period 6

Holmium · Ho

Atomic number67

SymbolHo

CategoryLanthanide

Standard stateSolid

Group · Period · Block3 · 6 · f

Electron configuration[Xe]6s2 4f11

Atomic mass164.93033 u

Atomic radius216 pm

Protons / Neutrons / Electrons67 / 98 / 67

Shells (e⁻ per shell)2, 8, 18, 29, 8, 2

Electronegativity (Pauling)1.23

Ionization energy6.022 eV

Electron affinity—

Oxidation states+3

Melting point1.75e+3 K · 1.47e+3 °C

Boiling point2.97e+3 K · 2.70e+3 °C

Density8.8 g/cm³

Year discovered1878

CPK color

#00FF9C

State at room temp (25 °C)

solid

Position