Calcium (Ca) — Element 20: Properties & Data | Aladdin Scientific
Calcium(Ca) — Element 20
Calcium (Ca) is a alkaline earth metal with atomic number 20 and atomic mass 40.08. It has melting point 1115 K (842 °C), boiling point 1757 K (1484 °C), density 1.54 g/cm³. It sits in group 2 and period 4 of the periodic table and has been known since antiquity.
Key facts
| Atomic mass | 40.0800 u |
|---|---|
| Electron configuration | [Ar]4s2 |
| Oxidation states | +2 |
| Electronegativity (Pauling) | 1 |
| Atomic radius (van der Waals) | 231 pm |
| Ionization energy | 6.113 eV |
| Melting point | 1115 K |
| Boiling point | 1757 K |
| Density | 1.54 g/cm³ |
| Standard state | Solid |
| Year discovered | Ancient |
Frequently asked questions
What is the electron configuration of calcium?
The ground-state electron configuration of calcium is [Ar]4s2.
What group and period is calcium in?
Calcium (Ca) is in group 2 and period 4 of the periodic table, classified as a alkaline earth metal.
What is the melting point of calcium?
Calcium melts at 1115 K (842 °C).
What is the standard state of calcium?
Calcium is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .