A) Arrange the following elements on the basis of first ionization enthalpy. Li, Be, B, C, N, O, F, Ne B) Arrange the following on the basis of their electron affinity. N, P, O, S, F, Cl

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The first ionization enthalpy (∆i H ) values of the third period elements, Na, Mg and Si are respectively 496, 737 and 786 kJ mol–1. Predict whether the first ∆i H value for Al will be more close to 575 or 760 kJ mol–1 ? Justify your answer.

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Which of the following will have the most negative electron gain enthalpy and which the least negative? P, S, Cl, F. Explain your answer.

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