Question

How does electron affinity vary in a group and period?

Answer 1

when an electron is acepted by an atom energy is released and more the energy more is the electron affinity. it is dependent on the effective nuclear charge of an atom.

so it decreases down the group and increases along a period from left to right.

but there are some exceptions as that of fluorine and chlorine , acc to the trend fluorne should have greater electron affinity but chlorine has the highest electron affinity as because of very small size of fluorine there are more electron pair repulsions and it makes fluorine less than chlorine in electron affinity. and the same can be said for oxygen and sulphur.

Answer 2

Answer:

it decreases down the group and increases along a period from left to right.

Explanation:

when an electron is accepted by an atom energy is released and more the energy more is the electron affinity. it is dependent on the effective nuclear charge of an atom.

so it decreases down the group and increases along a period from left to right.