Question

A half-life of a radioactive substance is the amount of time needed for one half of _____ to decay into a stable isotope.

Answer 1

nuclie in a sample is the answer

Answer 2

A half-life of a radioactive substance is the amount of time needed for one hald of the nuclie in a sample to decay into a stable isotope.Many protons and neutrons disturb the balance of binding energy from a strong nuclear forces resulting for the nucleus to be unstable. To be in a balance state, the unstable nucleus will give off a proton or neutron through radioactive decay.