Question

amongst the followimg element whose electronic configuration given below the one having the first highest ionization is
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Answer 1

Answer:

helium has highest ionisation

Answer 2

Answer:

Among options (a), (c) and (d), option (d) has the highest ionization energy because of extra stability associated with half-filled 3p-orbital. In option (b), the presence of 3d10 electrons offers shielding effect, as a result the 4p3 electrons do not experience much nuclear charge and hence the electrons can be removed easily.