Ca

Calcium

Atomic Number 20 · Metal turnings in argon

The most abundant metal in the human body. Essential for bones, teeth, and muscle contraction.

Atomic Mass

40.078 u

Category

Alkaline Earth Metal

Phase (STP)

Solid

Density

1.55 g/cm³

Melting Point

842 °C

Boiling Point

1484 °C

Electronegativity

1.0 (Pauling)

Atomic Radius

180 pm

Electron Configuration

[Ar] 4s2

Discovered

1808 — Humphry Davy

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Sample form: Metal turnings in argon

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