Isotope

Isotope

1. they are different atoms of an element with the same number of protons and electrons but different number of neutrons

2. For example, chlorine atoms have 17 protons, somecan have 18 neutrons and others 20.

   • this is an example of an isotope
     • Your mass number will number change

3. the presence of an isotope means that the relative atomic mass is not a whole number