Radium (Ra) - Element 88 | Properties & Electron Configuration
What is Radium?
Radium (Ra) is element 88, a alkaline earth metal in period 7, group 2. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s² 6p⁶ 7s².
| Atomic Number | 88 |
| Symbol | Ra |
| Atomic Mass | 226 u |
| Category | Alkaline Earth Metal |
| Period | 7 |
| Group | 2 |
| Block | s |
| Electron Configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s² 6p⁶ 7s² |
| Short Config | [Rn] 7s² |
| Electronegativity | 0.9 |
| Atomic Radius | N/A |
| Ionization Energy | 509 kJ/mol |
| Electron Affinity | N/A |
| Phase (STP) | Solid |
Electron Configuration
The full electron configuration of Radium is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 6s² 6p⁶ 7s². In noble gas shorthand, this is written as [Rn] 7s².
Radium is a s-block element in group 2, period 7.
Periodic Trends
Electronegativity: Radium has a Pauling electronegativity of 0.9. Within group 2, electronegativity generally decreases down the group.
Ionization Energy: 509 kJ/mol. Ionization energy generally increases across a period and decreases down a group.
View all 118 elements with trend overlays for electronegativity, atomic radius, ionization energy, and electron affinity.
Explore Radium on the Interactive Periodic TableRelated Topics
Beryllium (Be)
Properties of Beryllium - same group as Radium
Magnesium (Mg)
Properties of Magnesium - same group as Radium
Calcium (Ca)
Properties of Calcium - same group as Radium
Francium (Fr)
Properties of Francium - same period as Radium
Actinium (Ac)
Properties of Actinium - same period as Radium
Thorium (Th)
Properties of Thorium - same period as Radium