Pm
Promethium Symbol (Pm)
Promethium is element 61 of the periodic table. Copy its symbol Pm and see its atomic weight, electron configuration and physical properties.
What does Pm mean?
Pm is the chemical symbol for promethium, element number 61 in the periodic table. Promethium is a lanthanide in the f-block, period 6. It is a solid at room temperature and was discovered in 1945.
Codes and properties
| Chemical symbol | Pm |
|---|---|
| Atomic number (Z) | 61 |
| Mass number (no standard atomic weight) | [145] |
| Group / period | f-block / 6 |
| Element category | lanthanide |
| Electron configuration | [Xe]6s² 4f⁵ |
| State at 20 °C | Solid |
| Oxidation states | +3 |
| Melting point | 1315 K (1041.85 °C) |
| Boiling point | 3273 K (2999.85 °C) |
| Density | 7.26 g/cm³ |
| Discovered | 1945 |
How to type Pm
- Plain text: type
Pm— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as H₂O — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{Pm}in math mode, or use the mhchem package:\ce{Pm}. - HTML:
Pm; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for promethium?
The chemical symbol for promethium is Pm.
What is the atomic number of promethium?
Promethium has atomic number 61, meaning each atom has 61 protons.
What is the electron configuration of promethium?
The ground-state electron configuration of promethium is [Xe]6s² 4f⁵.
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Reference: Promethium on PubChem (NIH)