88Ra226
Radium
Alkaline earth metal · element 88 · group 2, period 7
Quick facts
| Symbol | Ra |
|---|---|
| Atomic number | 88 |
| Relative atomic mass | 226 |
| Category | Alkaline earth metal |
| Position | group 2, period 7 |
| State at 20 °C | Solid |
| Melting point | 700 °C |
| Boiling point | 1,737 °C |
| Density | 5.5 g/cm³ |
| Electronegativity | 0.9 |
| Electron configuration | [Rn] 7s2 |
About Radium
Radium has the symbol Ra and atomic number 88, which means every radium atom has 88 protons in its nucleus and, in a neutral atom, 88 electrons. At room temperature it is a solid.
Alkaline earth metals are in group 2. They are reactive metals (less reactive than group 1) that form compounds with a 2+ charge.
It melts at 700 °C and boils at 1,737 °C.
Explore it
See where radium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.