Po
Polonium
Polonium is a chemical element with the symbol Po and atomic number 84. It has a mass number of 209, sits in period 6 and group 16, and is classified as a post-transition metal.
Properties
| Symbol | Po |
|---|---|
| Atomic number | 84 |
| Mass number | 209 |
| Category | Post-transition metal |
| Group | 16 |
| Period | 6 |
| Electron configuration | [Xe] 4f14 5d10 6s2 6p4 |
| Outer-shell electrons | 6 |
The figure of 209 is a mass number rather than a measured atomic weight, because this element has no stable isotope.
Calculate with polonium
- Molar mass of any formula containing it
- Electron configuration, including ions
- Effective nuclear charge by Slater's rules
- Average atomic mass from isotope abundances
Group 16
Atomic weights are the IUPAC 2021 standard values, abridged to the conventional five significant figures. Group, period, category and electron configuration are derived from the atomic number rather than stored, so they cannot drift out of step with it.