Section Fve:The Structure of Atoms

1. What do atoms of the same element have in common? ... They have the same element and same number.
2. What are isotopes? .. One or two or more atoms having the same atomic number ut different mass numbers
3. How is an element average atomic mass calculated? ... Isotopes are any of the several different forms of an element each having different atomic mass (mass number). Isotopes of an element have nuclei with the same number of protons (the same atomic number) but different numbers of neutrons. Therefore, isotopes have different mass numbers, which give the total number of nucleons—the number of protons plus neutrons.
4. How is a Avogadros number used? ...  It is the number of particles in one mole of a given substance. used to convert units.