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Atomic Number	67

Atomic Symbol	Ho

Atomic Weight	164.93032 amu

Group	Rare Earth (Lanthanide Series)

Form	Solid

Density @ STP	8.80 g/cm³

Melting Point	1474 °C (2685.2 °F, 1747.15 °K)

Boiling Point	2700 °C ( 4892°F, 2973.15°K)

Heat of Fusion	17.0 kJ/mol (est.)

Heat of Vaporization	265 kJ/mol

First Ionization Potential	6.0216 eV

Electronegativity (on Pauling scale	1.23

Specific Heat Capacity	0.165 J/g K

Ground State Electron Configuration	4f¹¹ 5s² 5p⁶ 6s²

Oxidation State(s)	+3

Stable Isotopes and Natural Abundance on Earth	¹⁶⁵Ho, 100%

Atomic Radius	226 pm

Crystal Structure	Hexagonal

Discovered by	Soret; Delafontaine, 1878