हिन्दी में पढ़ेंHome › Elements › Barium
Barium (Ba)
Atomic number 56 · alkaline
| Atomic number | 56 |
|---|---|
| Atomic mass | 137.327 u |
| Molar mass | 137.327 g/mol |
| Category | alkaline |
| Group / period / block | 2 / 6 / s |
| Electron configuration | [Xe] 6s2 |
| Electrons per shell | 2, 8, 18, 18, 8, 2 |
| Electronegativity (Pauling) | 0.89 |
| Atomic radius | 215.0 pm |
| Density | 3.62 g/cm³ |
| First ionisation energy | 5.2117 eV |
| Melting point | 1000.15 K (727.00 °C) |
| Boiling point | 2118.15 K (1845.00 °C) |
| Common oxidation states | +2 |
| Abundance in Earth's crust | 425 ppm |
Uses
X-ray contrast meals, green fireworks
Discovery
1808, Sir Humphrey Davy