General

Calcium (Ca) properties


Atomic mass, symbol and atomic number

calcium is a naturally occurring element with the element symbol Ca and the atomic number 20. In the periodic table it stands with an atomic mass of 40.078 u in the 2nd main group. The chemical element discovered by Humphry Davy in 1808 is not radioactive and is in a solid state at room temperature.

Profile: Calcium (English: Calcium)

General
Chemical element:calcium
Symbol:Ca
Atomic number:20
Group:alkaline earth metal
Period:4
Block:s block
Series:alkaline earth metals
Appearance:silver
explorers:Humphry Davy
Year of discovery:1808
Atomic properties
Atomic mass:40.078 u
Atomic radius:180 pm
Covalent radius:176 pm
Van der Waals radius:231 pm
Electron configuration:Ar 4s2
ionization:589.8 kJ / mol
Physical Properties
Physical state:firmly
Density:1.55 g / cm3
Crystal structure:cubic
Magnetism:paramagnetic
molar volume:26,20 · 10-6 m3/ mol
Mohs hardness:1,75
Melting point:842 ° C
Boiling point:1487 ° C
Heat of fusion:8.54 kJ / mol
Heat of vaporization:153 kJ / mol
Thermal conductivity:200 W
Chemical properties
electronegativity:1,0

Did you know that ...

  • Calcium is considered an important element for the growth of bones and teeth?
  • Cheese, milk, poppy seeds and parsley are particularly rich in calcium?
  • Chalk made of calcium carbonate (CaCO3) consists?
  • pure calcium is very flammable and can even ignite itself in the air?
  • Burning calcium to form a bright red flame?