Explain the following:

(a) Electronegativity of elements increases on moving from left to right in the periodic table.

(b) Ionisation enthalpy decrease in a group from top to bottom?

Answers (1)

(a) Electronegativity of an element is the tendency of an atom of that element to attract shared electrons towards itself, and unlike ionisation enthalpy and electron gain enthalpy, it is not a measurable quantity. The increase in electronegativities across a period is due to decrease in size of atom and increase in nuclear charge.

(b)  As we go down a group, the outermost electron is increasingly becomes far from the nucleus, and there is an Increase in atomic size. Therefore, ionisation enthalpy decreases down the group.

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