Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Isotopes of copper
open-in-new
<p><a href="/facts/Copper/I8PEE8oX">Copper</a> (29Cu) has two stable isotopes, 63Cu and 65Cu, along with 28 radioisotopes. The most stable radioisotope is 67Cu with a <a href="/facts/Half-life/kGVH8BAB">half-life</a> of 61.83 hours. Most of the others have half-lives under a minute. Unstable copper isotopes with atomic masses below 63 tend to undergo <a href="/facts/Positron_emission/psWp4bJT">β+ decay</a>, while isotopes with atomic masses above 65 tend to undergo <a href="/facts/Beta_decay/vxTBlckp">β− decay</a>. 64Cu decays by both β+ and β−. </p><p>There are at least 10 <a href="/facts/Metastable_isomer/L8DHcqnk">metastable isomers</a> of copper, including two each for 70Cu and 75Cu. The most stable of these is 68mCu with a half-life of 3.75 minutes. The least stable is 75m2Cu with a half-life of 149 ns. </p>