21
Sc
44.956
Scandium
Element 21 · 44.956 u · d-block
transition metal
A rare transition metal used in aluminum-scandium alloys for aerospace and sports equipment like baseball bats.
Phase (STP)
Solid
Melting Point
1541 °C
Boiling Point
2836 °C
Density
2.989 g/cm³
Electronegativity
1.36
Atomic Radius
160 pm
Ionization Energy
633 kJ/mol
Electron Affinity
18 kJ/mol
Discovered
1879 · Lars Fredrik Nilson
Electron Configuration
[Ar] 3d1 4s2
Electron Orbitals
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