True or False
___ 1. In terms of subatomic particles, the composition of an alpha particle is composed of 4 protons and 2 neutrons.
___ 2. The explanation for how a positron particle is produced in the nucleus of a radioisotope and then ejected involves the conversion of a proton to neutron.
___ 3. After 1 half-lives have elapsed, the percentage of a radioactive sample which has not decayed is 25% the original sample