Isotopes of radium
has no stable or nearly stable isotopes, and thus a standard atomic weight cannot be given. The longest lived, and most common, isotope of radium is 226Ra with a half-life of. 226Ra occurs in the decay chain of 238U. Radium has 33 known isotopes from 202Ra to 234Ra.
In 2013 it was discovered that the nucleus of radium-224 is pear-shaped. This was the first discovery of an asymmetric nucleus.
