हिन्दी में पढ़ेंHome › Elements › Thallium
Thallium (Tl)
Atomic number 81 · post
| Atomic number | 81 |
|---|---|
| Atomic mass | 204.38 u |
| Molar mass | 204.38 g/mol |
| Category | post |
| Group / period / block | 13 / 6 / p |
| Electron configuration | [Xe] 4f14 5d10 6s2 6p |
| Electrons per shell | 2, 8, 18, 32, 18, 3 |
| Electronegativity (Pauling) | 1.8 |
| Atomic radius | 190.0 pm |
| Density | 11.8 g/cm³ |
| First ionisation energy | 6.1083 eV |
| Melting point | 577.15 K (304.00 °C) |
| Boiling point | 1746.15 K (1473.00 °C) |
| Common oxidation states | +1, +3 |
| Abundance in Earth's crust | 0.85 ppm |
Uses
Infrared optics, electronics
Discovery
1861, Sir William Crookes