25. What is Half-life? ) The amount of time it takes for half the nuclei in a sample of the isotope to decay The amount of time it takes for some of the nuclei in a sample of the isotope to decay The amount of time it takes for half the electrons in a sample of the isotope to decay the amount of time it takes to double the nuclei in a sample of the isotope to decay

## Step 1<br />The term "half-life" is a concept used in nuclear physics and chemistry. It refers to the time it takes for half of the atoms in a sample to decay. This decay is a process where unstable isotopes lose energy by emitting radiation.<br /><br />## Step 2<br />The half-life is not about the decay of electrons, but rather the decay of nuclei. This is because the decay process involves the nucleus of an atom, not the electrons.<br /><br />## Step 3<br />The half-life is not about doubling the number of nuclei in a sample. Instead, it is about the time it takes for half of the nuclei in a sample to decay.