cesium oxide
Also known as: Einecs 243-679-0, Oxydicesium, dicesium oxide
cesium oxide (CAS 20281-00-9) is a compound in the Inorganic Chemicals category listed in the Jingsj chemical database. It has the molecular formula Cs2O and a molecular weight of 281.81000 g/mol. Key properties include a melting point of 490°C and a density of 4.650. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 20281-00-9
- Jingsj CID
- J-28152-8
- Molecular Formula
- Cs2O
- Molecular Weight
- 281.81000 g/mol
- Category
- Inorganic Chemicals
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 490°C |
|---|---|
| Density | 4.650 |
| Exact Mass | 281.80600 |
| Appearance | yellow-orange hexagonal crystals |
| Additional Property | very soluble H2O; soluble acids [HAW93] |
Frequently Asked Questions
What is the CAS number of cesium oxide?
The CAS number of cesium oxide is 20281-00-9.
What are the molecular formula and molecular weight of cesium oxide?
cesium oxide has molecular formula Cs2O and molecular weight 281.81000 g/mol.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "cesium oxide (CAS 20281-00-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-28152-8 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.