88Ra
Element 88
Radium
Alkaline earth
Radium is a chemical element with symbol Ra and atomic number 88.
Key data
- Atomic number
- 88
- Atomic mass
- 226.000 u
- Group / Period
- 2 / 7
- Block
- s-block
- Phase at STP
- Solid
- Density
- 5.5 g/cm³
- Melting point
- 959.9 °C
- Boiling point
- 1736.8 °C
- Electron configuration
- [Rn] 7s2
Common uses
- •Glow-in-the-dark paints (historical)
- •Cancer therapy
- •Highly radioactive
Discovery
Year: 1898
Discovered by: Pierre Curie
Frequently asked questions
What is the atomic number of Radium?
Radium has atomic number 88. Its symbol is Ra and its atomic mass is 226 u.
What category of element is Radium?
Radium is classified as alkaline earth. It sits in group 2, period 7 of the periodic table.
What is Radium used for?
Common uses of Radium include: Glow-in-the-dark paints (historical), Cancer therapy, Highly radioactive.
When was Radium discovered?
Radium was discovered in 1898 by Pierre Curie.
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