56Ba137.33
Barium
Alkaline earth metal · element 56 · group 2, period 6
Quick facts
| Symbol | Ba |
|---|---|
| Atomic number | 56 |
| Relative atomic mass | 137.33 |
| Category | Alkaline earth metal |
| Position | group 2, period 6 |
| State at 20 °C | Solid |
| Melting point | 727 °C |
| Boiling point | 1,897 °C |
| Density | 3.51 g/cm³ |
| Electronegativity | 0.89 |
| Electron configuration | [Xe] 6s2 |
About Barium
Barium has the symbol Ba and atomic number 56, which means every barium atom has 56 protons in its nucleus and, in a neutral atom, 56 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 727 °C and boils at 1,897 °C.
Explore it
See where barium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.