→ ATOMIC NUMBER - 20 → ATOMIC MASS - 40.078 → DENSITY - 1.738 → ATOMIC RADIUS - 160 → MELTING POINT - 839.0 → BOILING POINT - 1484 .0 → SYMBOL - Ca → ELECTRON STRUCTURE - (AR)4s² → STRUCTURE - CRYSTAL STRUCTURE → YEAR OF DISCOVERY - 1808 → OXIDATION STATE - +2 → FIRST IONISATION ENERGY - 589.8 → ELECTRO - 1.13