Atomic Properties
- Atomic Number
- 82
- Atomic Mass
- 207.2000 u
- Electron Configuration
- [Xe] 4f14 5d10 6s2 6p2
- Electronegativity
- 1.87
- Block
- p-block
- Group
- 14
- Period
- 6
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 600.61 K
- Boiling Point
- 2022.00 K
- Density
- 11.3400 g/cm³
About Lead
Dense, toxic metal; used since antiquity; now mainly in batteries.
Why "Pb" for Lead?
Pb←Plumbum(Latin)
The symbol Pb comes from "Plumbum," the Latin word for lead. This is also the origin of "plumbing," as Romans used lead pipes. The English name "Lead" comes from Old English "lēad."
Isotopes of Lead
Lead has 4 naturally occurring isotopes.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 204Pb | 204 | 203.973044 | 1.400% | Stable |
| 206Pb | 206 | 205.9744657 | 24.10% | Stable |
| 207Pb | 207 | 206.9758973 | 22.10% | Stable |
| 208Pb | 208 | 207.9766525 | 52.40% | Stable |
Data source: NIH PubChem (aggregated from IUPAC, NIST)