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Holmium Facts

Chemical & Physical Properties of Holmium

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Holmium is a soft and malleable rare earth element belonging to the lanthanide series of elements.

Holmium is a soft and malleable rare earth element belonging to the lanthanide series of elements. This is a chunk of ultrapure holmium metal measuring approximately 1.5 x 2.5 cm.

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Periodic Table of the Elements

Holmium

Atomic Number: 67

Symbol: Ho

Atomic Weight: 164.93032

Discovery: Delafontaine 1878 or J.L. Soret 1878 (Switzerland)

Electron Configuration: [Xe] 4f11 6s2

Element Classification: Rare Earth (Lanthanide)

Word Origin: Holmia, the Latinized name for Stockholm, Sweden.

Density (g/cc): 8.795

Melting Point (K): 1747

Boiling Point (K): 2968

Appearance: relatively soft, malleable, lustrous, silvery metal

Atomic Radius (pm): 179

Atomic Volume (cc/mol): 18.7

Covalent Radius (pm): 158

Ionic Radius: 89.4 (+3e)

Specific Heat (@20°C J/g mol): 0.164

Evaporation Heat (kJ/mol): 301

Pauling Negativity Number: 1.23

First Ionizing Energy (kJ/mol): 574

Oxidation States: 3

Lattice Structure: Hexagonal

Lattice Constant (Å): 3.580

Lattice C/A Ratio: 1.570

References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952), CRC Handbook of Chemistry & Physics (18th Ed.)

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