Periodic Table
28
Ni
58.693
Nickel
Transition MetalNi²⁺ green; catalyst (hydrogenation); ferromagnetic.
Electronic Configuration
[Ar] 3d⁸ 4s²or1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ 4s²
Electron shells
2e⁻n=1
8e⁻n=2
16e⁻n=3
2e⁻n=4
Properties
Atomic number
28
Atomic mass
58.693 u
Category
Transition Metal
Block / Group / Period
d · 10 · 4
Valence electrons
2
Oxidation states
+2
Electronegativity
1.91
Atomic radius
149 pm
Ionization energy
737 kJ/mol
Electron affinity
112 kJ/mol
Melting point
1728 K / 1455 °C
Boiling point
3186 K / 2913 °C
Density
8.912 g/cm³
State at 25 °C
solid
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