Atomic Element Z = 21 • Transition Metal
Scandium (Sc) — Atomic Data, Electron Shells & Reactions
Scandium (symbol Sc, atomic number 21) has a standard atomic weight of 44.956 u and ground-state configuration [Ar] 3d1 4s2.
Atomic Number (Z)
21
IUPAC Symbol
Sc
Standard Atomic Weight
44.956 g/mol
Period / Group / Block
4 / 3 / d-block
Condensed Electron Config
[Ar] 3d1 4s2
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d1 4s2
Principal Shell Occupancy
[2, 8, 9, 2]
Pauling Electronegativity
1.36
First Ionization Energy
633 kJ/mol
Covalent Radius
170 pm
Melting Point
1814 K (1540.85 °C)
Boiling Point
3109 K (2835.85 °C)
Density
2.985 g/cm³
Oxidation States
+3
Sc (Z=21) — Valence shell highlighted in vermilion