Question

How the atomic size vary in a group? explain.

Answer 1

Answer:

Hello buddy here is your answer-

Explanation:

On moving from left to right along the period the size of the atom decrease due to the addition of the number of electons in every atom which results in the compact size of the atom due to the more force of attraction between electrons and protons so that the atomic size decrease along the period.

hope it will help u ✌️

Answer 2

Answer:

(1) In a period : Atomic radius decreases in a period from left to right (upto group 17). This is because as we move across a period, nuclearncharge increases but electrons enter the same shell. Thus, the screening effect of the inner core remains the same. As a result the valence electrons are tightly held by the nucleus and atomic size (radius) decreases. For example, in 2nd Period, it decreases from Li(152 pm) to F(64 pm).

(2) In a group : Down the group, as the atomic number increase, nuclear charge increses but number of shells increase. As a result, shielding effect increases and valence electrons are held by weaker attrctive forces. Thus, atomic radius increases. For example, atomic radius increases. For group 17 elements, the value increase from 1st member F (64 pm) to the last member At (140 pm).