A, B, C are three elements with atomic numbers, Z — 1, Z, Z + 1 respectively. B is an
inert gas. Answer the following questions
(a) Predict the group of A and C.
(b) which out of the three has positive electron gain enthalpy and why?
(c) Which of the three has least value of ionization enthalpy?
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Explanation:
The element having atomic number one greater than inert gases is alkali metal of the next period and one less than inert gases is halogen of the same period. Thus 'C' is an alkali metal and hence has the lowest ionization energy.
Hence the correct option is 'C'
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