SCANDIUM

Atomic Number: 21
Mass Number: 44.9559
Electron Configuration: 1s²2s²2p⁶3s²3p⁶4s²3d¹
Crystal Structure: Hexagonal Close-Packed
Density: 2.99 g/cm³
MeltingPoint: 1540^oC
First Ionization Energy: 633.1 kJ/mol
Second Ionization Energy: 1235 kJ/mol
Third Ionization Enery: 2389 kJ/mol
Important Oxidation States: +3
Metallic Radius: 164 pm