Atomic number 91Pa
Protactinium
প্রোট্যাকটিনিয়াম
- Actinide
- Period 7
- Atomic mass 231.040 u
- Solid
- Electrons per shell
- 2, 8, 18, 32, 20, 9, 2
- Electron configuration
- [Rn] 5f2 6d1 7s2
- Nucleus
- 91 protons, 140 neutrons
Speed1×
- Group
- None (f-block)
- Period
- 7
- Block
- f-block
- Category
- Actinide
- State at 25 °C
- Solid