(a) Electronegativity of
elements increases on moving from left to right in the periodic table as
non-metallic character increases, the tendency to accept electron increases and
the atomic radius decreases, i.e., effective nuclear charge increases.
(b) In a normal group, the
ionisation enthalpy decreases from top to bottom. On moving the group, the
atomic size increases gradually due to addition of one new principal energy
shell at each succeeding element. On account of this, the force of attraction
towards the outermost electron decreases and hence the ionisation enthalpy value
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