Radium (Ra) — Alkaline earth metal. Atomic number 88.
Luminous white radioactive metal
- Atomic number: 88
- Symbol: Ra
- Atomic mass: [226] u
- Category: Alkaline earth metal
- State: Solid
- Melting point: 699.85 °C / 973 K
- Boiling point: 1736.85 °C / 2010 K
- Density: 5.5 g/cm³ (20°C)
- Electron configuration: [Rn] 7s2
- Oxidation states: +2
- Electronegativity: 0.9
- Discovered by: Marie Curie and Pierre Curie (1898)
Common uses: Historic radiotherapy, Research
Biological role: No biological role.
Frequently Asked Questions about Radium
What is the atomic number of radium?
Radium has an atomic number of 88, meaning each atom contains 88 protons in its nucleus.
What is the atomic mass of radium?
The standard atomic weight of radium is [226] u (unified atomic mass units).
What category does radium belong to?
Radium is classified as a alkaline earth metal.
What is the state of radium at room temperature?
Radium is a solid at 20 °C (68 °F).
What is the melting point of radium?
The melting point of radium is 699.85 °C / 973 K.
What is the boiling point of radium?
The boiling point of radium is 1736.85 °C / 2010 K.
What is the density of radium?
The density of radium is 5.5 g/cm³ (20°C).
What is the electronegativity of radium?
Radium has a Pauling electronegativity of 0.9.
What is the electron configuration of radium?
The electron configuration of radium is [Rn] 7s2.
What are the common oxidation states of radium?
Radium commonly exhibits the following oxidation states: +2.
When was radium discovered?
Radium was discovered in 1898 by Marie Curie and Pierre Curie.
Is radium radioactive?
Radium is a naturally occurring radioactive element; all of its isotopes are radioactive.
What is the biological role of radium?
No biological role.
What are the common uses of radium?
Radium is used for: Historic radiotherapy; Research.
