Alkaline earth metal

Radium

Radium (Ra) has atomic number 88. PubChem classifies it as alkaline earth metal.

Atomic number

88

Symbol

Ra

Atomic weight (source value)

226.02541

Electron configuration

[Rn]7s2

Standard state

Solid

Electronegativity (Pauling)

0.9

Melting point (K)

973

Boiling point (K)

1413

Density (g/cm³)

5

Oxidation states

+2

Understanding this entry

Atomic number is the number of protons in the nucleus. Properties are reference values and may depend on conditions and measurement conventions. An atomic weight is not the mass of every isotope. For elements without a standard atomic weight, a source may report an isotope mass number. Blank source values are shown as unavailable rather than estimated.

Further reading and reference: NIH PubChem source dataset ↗. Values and educational summaries are not a substitute for specialised advice.