Atoms Compounds and Isotopes

Atoms Compounds and Isotopes

1. Atomic Number and Mass Number Describe an Atom

   • The Mass Number (top number) is the total amount of protons and neutrons. The Atomic Number (bottom number) is the total amount of protons
   • The atomic number tells you how many protons there are. Atoms of the same element all have the same number of protons, so atoms of different elements will have different numbers of protons