Caesium

from source

Cs · 132.905452 g/mol

Cs · cesio

What is Caesium?

The most reactive metal there is, liquid just above room temperature, and the atom whose vibration defines the length of a second. Element 55. from source

CategoryElement & material

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Fig. 1 · 2D structure RDKit

SMILES[Cs]

Where you'll find it

A pure element or an engineered material, rather than an ingredient in a product. See the rest of the element & material group.

Toxicity & hazards

Toxicity · LD50

1,700 mg/kg · low toxicity · LD50 mouse other from source

DangerFlammableCorrosiveH260, H314, H318from source

Sources & methodology

PubChem CID: 5354618
Wikidata: Q1108
Structure: PubChem → RDKit
LD50: PubChem
Data refreshed: September 13, 2026

How MoleculeFinder sources and labels its data