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Along a period
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a
nuclear charge increases that helps gain of e- in V.S.
b
down a group size of atom increases and gain of e- in V.S. releases less energy.
c
gain of e- by ‘O’ and ‘F’ feels repulsion of dense cloud of V.S. electrons and ∆egH is quite less negative
d
all are correct
answer is D.
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Detailed Solution
With increase of effective nuclear charge e- acceptance wii become easier can be observed across the period. In case of O,F due to small size of atoms they are with inter electronic repulsions which decreases the energy released during addition of an electron
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