20
Ca
40.078
Calcium (Ca)
Element 20 · Period 4 · Group 2
alkaline-earth
solid at room temp
s-block
About Calcium
Most abundant metal in the human body. Essential for bones, teeth, and muscle function.
Physical Properties
Atomic Mass
40.078 u
State at 25°C
Solid
Melting Point
842 °C
Boiling Point
1484 °C
Density
1.55 g/cm³
Magnetism
Diamagnetic
Atomic Properties
Electron Configuration
[Ar] 4s²
Electron Shells
2, 8, 8, 2
Electronegativity
1.0
Atomic Radius
194 pm
Ionization Energy
590 kJ/mol
Oxidation States
+2
Discovery & History
Discovered By
Humphry Davy
Discovery Year
1808
Named By
Humphry Davy
Name origin: Latin: calx (lime)
Frequently Asked Questions
- Is Calcium a metal, nonmetal, or metalloid?
- Calcium is classified as a alkaline-earth.
- What state is Calcium in at room temperature?
- Calcium is a solid at standard room temperature (25°C).
- What is the atomic mass of Calcium?
- Calcium has an atomic mass of 40.078 atomic mass units (u).
- Who discovered Calcium?
- Calcium was discovered by Humphry Davy in 1808.
- Where is Calcium on the periodic table?
- Calcium is element number 20, located in period 4 and group 2.