Periodic Table
21
Sc
44.956
Scandium
Transition MetalFirst transition metal; mainly +3; colourless ions (d⁰).
Electronic Configuration
[Ar] 3d¹ 4s²or1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹ 4s²
Electron shells
2e⁻n=1
8e⁻n=2
9e⁻n=3
2e⁻n=4
Properties
Atomic number
21
Atomic mass
44.956 u
Category
Transition Metal
Block / Group / Period
d · 3 · 4
Valence electrons
2
Oxidation states
+3
Electronegativity
1.36
Atomic radius
184 pm
Ionization energy
633 kJ/mol
Electron affinity
18 kJ/mol
Melting point
1814 K / 1541 °C
Boiling point
3109 K / 2836 °C
Density
2.99 g/cm³
State at 25 °C
solid
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