Mo
Molybdenum
Molybdenum is a chemical element with the symbol Mo and atomic number 42. It has a standard atomic weight of 95.95, sits in period 5 and group 6, and is classified as a transition metal.
Properties
| Symbol | Mo |
|---|---|
| Atomic number | 42 |
| Standard atomic weight | 95.95 |
| Category | Transition metal |
| Group | 6 |
| Period | 5 |
| Electron configuration | [Kr] 4d5 5s1 |
| Outer-shell electrons | 2 |
The figure of 95.95 is a standard atomic weight.
Compounds containing molybdenum
1 of the compounds in this reference contain Mo, listed by the fraction of their mass it makes up.
| Compound | Formula | Atoms | % by mass |
|---|---|---|---|
| sodium molybdate | MoNa2O4 | 1 | 46.6% |
Calculate with molybdenum
- 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 6
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.