What would two different isotopes of an atom have in common? Number of protons Atomic weight Atomic mass Number of neutrons

## Step 1<br />Isotopes are different forms of a particular element that have the same number of protons but different numbers of neutrons. This means that while the number of protons (which determines the atomic number and the identity of the element) remains the same, the number of neutrons can vary.<br /><br />## Step 2<br />The atomic weight and atomic mass of an isotope are determined by the total number of protons and neutrons in the nucleus. Since the number of protons is the same for all isotopes of a given element, the atomic weight and atomic mass will also be the same for all isotopes of that element.<br /><br />## Step 3<br />Therefore, the only thing that two different isotopes of an atom would have in common is the number of protons.