73Ta180.95
Tantalum (Ta)
Element 73 · Transition metal
Tantalum (Ta) is a chemical element with atomic number 73. It is classified as a transition metal in period 6, group 5 of the periodic table (the d-block). Its standard atomic weight is 180.95 u and its ground-state electron configuration is [Xe] 4f¹⁴ 5d³ 6s².
Tantalum facts
| Atomic number (Z) | 73 |
|---|---|
| Symbol | Ta |
| Standard atomic weight | 180.95 u |
| Category | Transition metal |
| Group | 5 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 4f¹⁴ 5d³ 6s² |
| Electronegativity (Pauling) | 1.5 |
| State at 20 °C | Solid |
| Protons / electrons | 73 / 73 |
| Neutrons (most common isotope, approx.) | 108 |
| Molar mass | 180.95 g/mol |