Selenium
Also known as: EINECS 231-957-4, MFCD00134090, elemental selenium, gray selenium, selenium atom
Selenium (CAS 7782-49-2) is a compound in the Inorganic Chemicals category listed in the Jingsj chemical database. It has the molecular formula Se and a molecular weight of 78.960 g/mol. Key properties include a melting point of 217 °C(lit.), a boiling point of 684.9 °C(lit.) and a density of 4.81 g/mL at 25 °C(lit.). It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed, H331 — Toxic if inhaled and H373 — May cause damage to organs through prolonged exposure. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 7782-49-2
- Jingsj CID
- J-48434-3
- Molecular Formula
- Se
- Molecular Weight
- 78.960 g/mol
- Category
- Inorganic Chemicals
- Last updated
- 8/21/2026
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Request a quotePhysicochemical Properties
| Melting Point | 217 °C(lit.) |
|---|---|
| Boiling Point | 684.9 °C(lit.) |
| Density | 4.81 g/mL at 25 °C(lit.) |
| Exact Mass | 79.916519 |
GHS Safety & Compliance
- H301 — Toxic if swallowed
- H331 — Toxic if inhaled
- H373 — May cause damage to organs through prolonged exposure
- H413
Frequently Asked Questions
What is the CAS number of Selenium?
The CAS number of Selenium is 7782-49-2.
What are the molecular formula and molecular weight of Selenium?
Selenium has molecular formula Se and molecular weight 78.960 g/mol.
Is Selenium hazardous?
Selenium has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H331 — Toxic if inhaled; H373 — May cause damage to organs through prolonged exposure.
What are the upstream and downstream products of Selenium?
For Selenium, Downstream Products: Selenium(IV) chloride (-8 mesh), selenium chloride, Triphenylphosphine selenide.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Selenium (CAS 7782-49-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-48434-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.