20 Ca Calcium 40.078 u

Calcium

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Period
4
Group
2
Block
s-block
Phase (STP)
Solid

Calcium is the most abundant metal in the human body. It is essential for bones, teeth, and cellular signaling.

Appearance: Dull gray, silver

Physical Properties

Atomic Mass 40.078 u
Density 1.55 g/cm³
Melting Point 841.9 °C
Boiling Point 1483.8 °C
Phase at STP Solid
Atomic Radius 194.0 pm

Electronic Properties

Electronegativity 1.0
Ionization Energy 589.8 eV
Electron Affinity 2.37 eV
Valence Electrons 2

Electron Configuration

Configuration [Ar] 4s²

Electron Shell Configuration

Calcium electron shell configuration Ca 2e⁻ 8e⁻ 8e⁻ 2e⁻

Position in Periodic Table

Calcium position in the periodic table Ca

Discovery

Discovered by: Humphry Davy
Year: 1808

Compounds Containing Calcium

More Alkaline Earth Metal

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Frequently Asked Questions

What is Calcium?
Calcium (Ca) is a chemical element with atomic number 20. It is a solid at standard temperature and pressure, classified as a alkaline earth metal.
What are the key properties of Calcium?
Calcium has an atomic mass of 40.078 u, density of 1.55 g/cm³, melting point of 841.9°C, boiling point of 1483.8°C.
What is the electron configuration of Calcium?
The electron configuration of Calcium is [Ar] 4s2. It is in the s-block of the periodic table.
Who discovered Calcium?
Calcium was discovered by Humphry Davy in 1808.
What is the electronegativity of Calcium?
Calcium has an electronegativity of 1.0 on the Pauling scale.