Atomic Number
Topic Description
Upon completion of this module, you should be able to know definitions of atomic number, mass number, and isotopes and Write the isotope notation of elements. Atomic Number (Z) is the number of protons (+) in the nucleus of an atom. In the visual, there are 3 protons and the atomic number of the atom is 3. The atomic number is particularly important because the number of protons in an atom tells us what kind of atom it is. It is represented by (Z).
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