20 Ca 40.0784

Calcium

ALKALINE EARTH METAL

Phase: Solid

Discovered: Humphry Davy

Block: S

Summary

Calcium is a chemical element with symbol Ca and atomic number 20. Calcium is a soft gray alkaline earth metal, fifth-most-abundant element by mass in the Earth's crust. The ion Ca2+ is also the fifth-most-abundant dissolved ion in seawater by both molarity and mass, after sodium, chloride, magnesium, and sulfate.

Source: Wikipedia

Physical Properties

Atomic Mass 40.0784 u

Density 1.55 g/cm³

Melting Point 1115 K

Boiling Point 1757 K

Molar Heat 25.929 J/(mol·K)

Electron Affinity 2.37 kJ/mol

Ionization Energies

1^st: 589.8 kJ/mol

2^nd: 1145.4 kJ/mol

3^rd: 4912.4 kJ/mol

4^th: 6491 kJ/mol

5^th: 8153 kJ/mol

6^th: 10496 kJ/mol

7^th: 12270 kJ/mol

8^th: 14206 kJ/mol

9^th: 18191 kJ/mol

10^th: 20385 kJ/mol

11^th: 57110 kJ/mol

12^th: 63410 kJ/mol

13^th: 70110 kJ/mol

14^th: 78890 kJ/mol

15^th: 86310 kJ/mol

16^th: 94000 kJ/mol

17^th: 104900 kJ/mol

18^th: 111711 kJ/mol

19^th: 494850 kJ/mol

20^th: 527762 kJ/mol