Sb
Antimony
Antimony is a chemical element with the symbol Sb and atomic number 51. It has a standard atomic weight of 121.76, sits in period 5 and group 15, and is classified as a metalloid.
Properties
| Symbol | Sb |
|---|---|
| Atomic number | 51 |
| Standard atomic weight | 121.76 |
| Category | Metalloid |
| Group | 15 |
| Period | 5 |
| Electron configuration | [Kr] 4d10 5s2 5p3 |
| Outer-shell electrons | 5 |
The figure of 121.76 is a standard atomic weight.
Compounds containing antimony
1 of the compounds in this reference contain Sb, listed by the fraction of their mass it makes up.
| Compound | Formula | Atoms | % by mass |
|---|---|---|---|
| antimony trioxide | O3Sb2 | 2 | 83.5% |
Calculate with antimony
- 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 15
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.