Arrange the elements N, P, O and S in the order of (i) increasing first ionisation enthalpy. (ii) increasing non-metallic character. Give reason for the arrangement assigned.

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TextTrends in Ionization Enthalpy Across Periodic TablePeriodic Trends in Chemical Properties of Elements

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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.

TextTrends in Ionization Enthalpy Across Periodic Table