1. the mass number and atomic number isotopes Isotopes (isotope) refers to the same kind of elemental atoms with the same atomic number (Z), but mass number (A) is not the same, for example, there are 3 oxygen isotopes are. -An SEO tone (isotone) refers to atoms of different types of elements that have the same number of neutron. But the number of protons, atomic number and mass number, for example, is not the same as neutron: 20.-An SEO Bar (isobar) refers to atoms of different types of elements that have the same mass number. But different atomic number, such as basic atomic structure with from the atomic structure. Conclude that the center of the atom is Proton and neutron particles address called the nucleus (nucleus) which is called the shell (shell) or power (enery level).
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