Cu
Copper
Copper is a chemical element with the symbol Cu and atomic number 29. It has a standard atomic weight of 63.546, sits in period 4 and group 11, and is classified as a transition metal.
Properties
| Symbol | Cu |
|---|---|
| Atomic number | 29 |
| Standard atomic weight | 63.546 |
| Category | Transition metal |
| Group | 11 |
| Period | 4 |
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s1 |
| Outer-shell electrons | 2 |
The figure of 63.546 is a standard atomic weight.
Compounds containing copper
3 of the compounds in this reference contain Cu, listed by the fraction of their mass it makes up.
| Compound | Formula | Atoms | % by mass |
|---|---|---|---|
| copper oxide | CuO | 1 | 79.9% |
| copper chloride | Cl2Cu | 1 | 47.3% |
| copper sulfate | CuO4S | 1 | 39.8% |
Calculate with copper
- 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 11
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.