A metallic ion Z\(^{2+}\) with an inert gas structure contains 18 electrons. How many protons are contained in this ion?
The number of electron would have been equal to number of proton if the atom were a neutral atom or represented as Z without Z\(^{2+}\). But because it is Z\(^{2+}\), carrying +2, meaning 2electrons were given out, therefore number of protons will be more than number electron by 2. i.e number of electron + 2 = 18 + 2 = 20. Therefore, the number of protons will be 20.
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