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Atomic number Atomic number  Definition :-  Atomic number is the number of protons in nucleus. eg. Helium About  explanation of the superscripts and subscripts seen in atomic number notation. Atomic number is the number of protons, and therefore also the total positive charge, in the atomic nucleus. The  Rutherford–Bohr model  of the  hydrogen atom  ( Z  = 1 ) or a hydrogen-like ion ( Z  > 1 ). In this model it is an essential feature that the photon energy (or frequency) of the electromagnetic radiation emitted (shown) when an electron jumps from one orbital to another be proportional to the mathematical square of atomic charge ( Z 2 ). Experimental...