Cs
Cesium Symbol (Cs)
Cesium is element 55 of the periodic table. Copy its symbol Cs and see its atomic weight, electron configuration and physical properties.
What does Cs mean?
Cs is the chemical symbol for cesium, element number 55 in the periodic table. Cesium is an alkali metal in group 1, period 6. It is a solid at room temperature and was discovered in 1860.
Codes and properties
| Chemical symbol | Cs |
|---|---|
| Atomic number (Z) | 55 |
| Atomic weight (PubChem) | 132.9054520 |
| Group / period | 1 / 6 |
| Element category | alkali metal |
| Electron configuration | [Xe]6s¹ |
| State at 20 °C | Solid |
| Oxidation states | +1 |
| Electronegativity (Pauling) | 0.79 |
| Melting point | 301.59 K (28.44 °C) |
| Boiling point | 944 K (670.85 °C) |
| Density | 1.93 g/cm³ |
| Discovered | 1860 |
How to type Cs
- Plain text: type
Cs— 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{Cs}in math mode, or use the mhchem package:\ce{Cs}. - HTML:
Cs; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for cesium?
The chemical symbol for cesium is Cs.
What is the atomic number of cesium?
Cesium has atomic number 55, meaning each atom has 55 protons.
What is the electron configuration of cesium?
The ground-state electron configuration of cesium is [Xe]6s¹.
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Reference: Cesium on PubChem (NIH)