88
Ra
Radium
Radium
Radium (Ra)
Alkaline Earth Metals · Solid · Period 7 · Group 2
Element Properties
- Atomic Number
- 88
- Symbol
- Ra
- Atomic Mass
- 226.0254
- Category
- Alkaline Earth Metals
- Standard State
- Solid
- Period
- 7
- Group
- 2
- Electronegativity
- 0.9
- Atomic Radius
- 283
- Ionization Energy
- 5.28
- Electron Affinity
- —
- Oxidation States
- +2
- Melting Point
- 973 K (699.85 °C)
- Boiling Point
- 1413 K (1139.85 °C)
- Density
- 5
- Electron Configuration
- [Rn]7s2
- Year Discovered
- 1898
Electron shells
[Rn]7s2
Electrons are arranged in shells (principal energy levels) around the nucleus. The diagram is a schematic — orbitals in the same shell are not drawn separately.
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Frequently asked questions
What is the atomic number of Radium?
The atomic number of Radium is 88, which equals the number of protons in its nucleus.
What is the atomic mass of Radium?
The atomic mass of Radium is approximately 226.0254 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Radium?
The electron configuration of Radium is [Rn]7s2.
Where is Radium in the periodic table?
Radium is located in period 7, group 2.
When was Radium discovered?
Radium was discovered in 1898.
Related elements
Same group
4
Be
Beryllium
9.012
12
Mg
Magnesium
24.305
20
Ca
Calcium
40.08
38
Sr
Strontium
87.62
56
Ba
Barium
137.33