89Ac Actinium
In general, actinides are very chemically active metals, and will react with air, water and acids, but not with bases.
What is an interesting fact about actinium?
Word origin: The word actinium comes from the Greek aktis or aktinos, which means beam or ray. Discovery: Actinium has two independent discoverers: Andre Debierne, who found it in 1899, and F. Giesel, who discovered it in 1902. Actinium has 36 isotopes, none of which are stable.
Which is the rarest element on the Earth?
A team of researchers using the ISOLDE nuclear-physics facility at CERN has measured for the first time the so-called electron affinity of the chemical element astatine, the rarest naturally occurring element on Earth.
