Actinium

Name:
Actinium
Detailed information:

M Formula:	Ac
Properties:
Atomic number 89, aw 227 (most stable isotope), silvery white metal. Mp 1050C, bp (est) 3200C, oxidation state +3. Eleven radioactive isotopes; 227 has half-life of 21.8 years.
Derivation:
Uranium ores; neutron bombardment of radium. Several compounds have been prepared. Available commercially at 98% minimum purity.
Hazard:
Radioactive bone-seeking poison.
Use:
Radioactive tracer (225 isotope).

See Lanthanum.