Question

What changes do we observe in valency and atomic size as we go from

left to right across a period in the Modern Periodic Table?

For questions 8 and 9, two statements are given – one labelled as

Assertion (A) and the other labelled as Reason (R). Select the correct

answer to these questions from the options (i), (ii), (iii) and (iv) as given

below :

(i) Both A and R are true and R is the correct explanation of A.

(ii) Both A and R are true, but R is not the correct explanation

of A.

(iii) A is true, but R is false.

(iv) A is false, but R is true​

Answer 1

Answer:

When we go from left to right in a period then

• the atomic size decreases as the effective nuclear charge increases
• the valency increases upto the middle and then decreases