p-Block elementsMedium

Question

In a period, the first ionization enthalpy of the element at extreme left and the negative electron gain enthalpy of the extreme right element, except noble gases, are respectively.

Options

A.lowest and lowest
B.highest and lowest
C.lowest and highest
D.highest and highest

Solution

Sol. [Key Concept: The leftmost element (group 1) has the lowest first ionization enthalpy and the rightmost (group 17) has the most negative (highest magnitude) electron gain enthalpy: lowest and highest.]

Left most element in a period will be of group 1 which will have lowest IE, while right most element will be of group 17 which will have most negative $\Delta H_{eg}$.

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