Actinium

Actinium is a radioactive element.

Actinium-227 occurs in uranium ore.

Actinium-227 is a decay product of uranium-235.

Actinium was discovered by André-Louis Debierne in 1899.

Actinium is a silvery metal.

Actinium melts at 1,051°C.

Actinium vaporizes at 3,198°C.

The half life of actinium-225 is approximately 10 days.

The half life of actinium-224 is 2.7 hours.