Ca
20 alkaline earth metal Generated with AI
Calcium
Symbol Ca
Atomic Mass 40.0784
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.
Properties
- Phase: Solid
- Density: 1.55 g/cm³
- Melting Point: 1115 K
- Boiling Point: 1757 K