Hafnium

Document v1 · published by Koskamo · updated 2026-10-04

Hafnium (Hf) is chemical element 72, a transition metal in group 4, period 6 (PubChem).

Atomic number: 72
Symbol: Hf
Group: 4
Period: 6
Atomic mass: 178.49 u
Electron configuration: [Xe]6s2 4f14 5d2
Electronegativity (Pauling scale): 1.3
Atomic radius (van der Waals): 212 pm
Ionization energy: 6.825 eV
Oxidation states: +4
Standard state: Solid
Melting point: 2506 K
Boiling point: 4876 K
Density: 13.3 g/cm³
Chemical group: Transition metal
Year discovered: 1923

Source and provenance

Original source: pubchem.ncbi.nlm.nih.gov
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: PubChem periodic table data (NIH/NLM, pubchem.ncbi.nlm.nih.gov/ptable); group and period from Jefferson Lab via PubChem

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Version history

Published by Koskamo2026-10-04
Version 1