Periodic Table
40
Zr
91.224
Zirconium
Transition MetalCorrosion resistant; zircaloy in nuclear reactors; ~Hf (lanthanoid contraction).
Electronic Configuration
[Kr] 4d² 5s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d² 5s²
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
10e⁻n=4
2e⁻n=5
Properties
Atomic number
40
Atomic mass
91.224 u
Category
Transition Metal
Block / Group / Period
d · 4 · 5
Valence electrons
2
Oxidation states
+4
Electronegativity
1.33
Atomic radius
206 pm
Ionization energy
640 kJ/mol
Electron affinity
41 kJ/mol
Melting point
2128 K / 1855 °C
Boiling point
4682 K / 4409 °C
Density
6.506 g/cm³
State at 25 °C
solid
Personal Notes
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