Isotopes of californium

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Californium (98Cf) is an artificial element, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 245Cf in 1950. There are 20 known radioisotopes ranging from 237Cf to 256Cf and several short-lived nuclear isomers.

Excerpt from the Wikipedia article “Isotopes of californium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: JWBE, Public domain, via Wikimedia Commons.