Question

The electron affinity increases on moving from left to right along a period. Arrange the reasons in a proper sequence.
(a) The amount of energy released during the addition of an electrons increases from left to right along a period.
(b) Effective nuclear charge of the elements increases from left to right.
(c) The atomic size of the elements decreases from left to right.
(d) The tendency to gain electrons and form anion increases from left to right.

• A. a c b d
• B. b c d a
• C. c a d b
• D. d c b a

Answer 1

The correct option is B b c d a

As we know the trends in periodic table

$\to$effective nuclear charge of elements when increase it holds the electron tightly because of these attraction, size of element reduced in a period from left to right. And because of more effective nuclear charge it will attracts or gain electron

and therefore amount of energy released during the addition of an electron increase from left to right along a period.