Isotopes of lawrencium

Lawrencium (103Lr) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be synthesized was 258Lr in 1961. There are fourteen known isotopes from 251Lr to 266Lr, and seven isomers. The longest-lived known isotope is 266Lr with a half-life of 11 hours.

Isotopes of lawrencium (103Lr)
Main isotopes Decay
abun­dance half-life (t1/2) mode pro­duct
256Lr synth 27.9 s α 252Md
β+ 256No
260Lr synth 3.0 min α 256Md
β+ 260No
261Lr synth 39 min SF
262Lr synth 4 h β+ 262No
264Lr synth 4.8 h SF
266Lr synth 11 h SF
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