43Tc[98]
Technetium (Tc)
Element 43 Ā· Transition metal
Technetium (Tc) is a chemical element with atomic number 43. It is classified as a transition metal in period 5, group 7 of the periodic table (the d-block). Its most stable known isotope has mass number 98 and its ground-state electron configuration is [Kr] 4dāµ 5sĀ².
Technetium facts
| Atomic number (Z) | 43 |
|---|---|
| Symbol | Tc |
| Mass number of most stable isotope | [98] |
| Category | Transition metal |
| Group | 7 |
| Period | 5 |
| Block | d-block |
| Electron configuration | [Kr] 4dāµ 5sĀ² |
| Electronegativity (Pauling) | 1.9 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 43 / 43 |
| Neutrons (most common isotope, approx.) | 55 |
| Molar mass | 98 g/mol |