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79
Au
196.97
Gold
Transition metals · Group 11 · Period 6
Gold never tarnishes and resists oxidation better than any other metal, which is why it coats connectors and bonding pads — roles where high-purity copper usually carries the current underneath.
Atomic properties
| Atomic number | 79 |
|---|---|
| Symbol | Au |
| Standard atomic weight | 196.97 |
| Classification | Transition metals |
| Group | 11 |
| Period | 6 |
| Block | d-block |
| Electron configuration | [Xe] 4f14 5d10 6s1 |
| Electronegativity (Pauling) | 2.54 |
| Common oxidation states | +3, +1 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 19.30 g/cm³ |
| Melting point | 1064.18 °C |
| Boiling point | 2856 °C |
| Discovered | Ancient |
| CAS number | — |