88
Ra
Radium
Alkaline earth metal period 7 group 2 s-block discovered: 1898
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 88
- Atomic mass
- 226.02541 a.m.u.
- Electron configuration
- [Rn]7s2
- Electronegativity
- 0.9 on the Pauling scale
- Atomic radius
- 283 pm
- Ionization energy
- 5.279 eV
- Oxidation states
- +2
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 973 K (699,85 °C)
- Boiling point
- 1413 K (1 139,85 °C)
- Density
- 5 g/cm³