Question

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

• A. 1324
• B. 3241
• C. 3142
• D. 4321

Answer 1

The correct option is B

3241

Explanation for Correct option:

B) Proper sequence of Electron affinity in a period.

3.In a period, from left to right atomic size decreases as the electrons are added to the same shell.

2.Effective nuclear charge increases from left to right due to the decrease in the atomic size.

4.As the nuclear charge increases, tendency of an atom to gain electrons increases.

1.Electron affinity : The amount of energy released when an electron is added to the neutral isolated gaseous atom is called electron affinity.

Hence,B) is the correct option - The proper sequence of electron affinity is 3241.