20
Ca
Calcium
Calcium
Calcium (Ca)
Alkaline Earth Metals · Solid · Period 4 · Group 2
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Element Properties
- Atomic Number
- 20
- Symbol
- Ca
- Atomic Mass
- 40.08
- Category
- Alkaline Earth Metals
- Standard State
- Solid
- Period
- 4
- Group
- 2
- Electronegativity
- 1
- Atomic Radius
- 231
- Ionization Energy
- 6.11
- Electron Affinity
- —
- Oxidation States
- +2
- Melting Point
- 1115 K (841.85 °C)
- Boiling Point
- 1757 K (1483.85 °C)
- Density
- 1.54
- Electron Configuration
- [Ar]4s2
- Year Discovered
- Ancient
Frequently asked questions
What is the atomic number of Calcium?
The atomic number of Calcium is 20, which equals the number of protons in its nucleus.
What is the atomic mass of Calcium?
The atomic mass of Calcium is approximately 40.08 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Calcium?
The electron configuration of Calcium is [Ar]4s2.
Where is Calcium in the periodic table?
Calcium is located in period 4, group 2.
When was Calcium discovered?
Calcium has been known since antiquity.
Related elements
Same group
4
Be
Beryllium
9.012
12
Mg
Magnesium
24.305
38
Sr
Strontium
87.62
56
Ba
Barium
137.33
88
Ra
Radium
226.025