20Ca40.078
Calcium
Alkaline earth metal · element 20 · group 2, period 4
Quick facts
| Symbol | Ca |
|---|---|
| Atomic number | 20 |
| Relative atomic mass | 40.078 |
| Category | Alkaline earth metal |
| Position | group 2, period 4 |
| State at 20 °C | Solid |
| Melting point | 842 °C |
| Boiling point | 1,484 °C |
| Density | 1.55 g/cm³ |
| Electronegativity | 1 |
| Electron configuration | [Ar] 4s2 |
About Calcium
Calcium has the symbol Ca and atomic number 20, which means every calcium atom has 20 protons in its nucleus and, in a neutral atom, 20 electrons. At room temperature it is a solid.
Alkaline earth metals are in group 2. They are reactive metals (less reactive than group 1) that form compounds with a 2+ charge.
It melts at 842 °C and boils at 1,484 °C.
Explore it
See where calcium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.