Chemical Substance attributes
CAS Registry Number
7440-14-4
Canonical SMILES
[Ra]
DSSTox ID
DTXSID2024294
UNII
W90AYD6R3Q
Other attributes
Wikidata ID
Radium (chemical symbol - Ra, from Lat. Radium) is a chemical element of the 2nd group (according to the outdated classification - the main subgroup of the second group, IIA), the seventh period of the periodic system of chemical elements of D. I. Mendeleev, with atomic number 88.
A simple substance radium is a shiny alkaline earth metal of silvery-white color, quickly tarnishing in air. It has a high chemical activity.
Radioactive. The most stable nuclide is 226Ra (half-life of about 1600 years).
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