how many protons are in a lithium nucleus
Isotopes of lithium Lithium-4 contains three protons and one neutron. It is the shortest-lived known isotope of lithium, with a half-life of about 91 yoctoseconds, 6977909999999999999♠9.1×10−23 seconds and decays by proton emission to helium-3.[3] Lithium-4 can be formed as an intermediate in some nuclear fusion reactions.