Atomic number or the Nuclear charge
(i) Number of protons present in nucleus of an atom is called as the atomic number (Z).
(ii) It was described by Moseley as shown below,
here, V = X - ray's frequency
Z= atomic number of the metal a& b are constant.
(iii) Atomic number = Number of positive charge on the nucleus = Number of protons in nucleus = Number of electrons in neutral atom.
(iv) The two different elements can never have the identical atomic number.
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