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72 Transition Metal
Hf

Hafnium

RIS 0.006
Velocity +0.000
Rank#63
Co-citedZr

Hafnium (Hf) is a transition metal with atomic number 72: a neutral hafnium atom has 72 protons and 72 electrons. Atomic mass 178.49 u, electron configuration [Xe] 4f14 5d2 6s2. Hafnium is a corrosion-resistant metal used in nuclear reactor control rods.

Physical properties
Atomic mass 178.49 u
Category Transition Metal
Block d-block
State Solid
Config [Xe] 4f14 5d2 6s2
Electronegativity 1.3
Density 13.31 g/cm³
Melting 2506.0 K
Boiling 4876.0 K
Ionization 658.5 kJ/mol
Oxidation +2, +3, +4
Discovered 1923 · Dirk Coster, George de Hevesy
Hafnium's history

Research intensity over time

Research communities behind this literature

Groups of papers that cite each other densely, with the share of Hafnium's tracked research in each.