Question

Q17. (i) Identify the reason for the decrease of atomic size in the period-
(a) New shells are being added which increase the distance between outermost
electrons and nucleus.
(b) Increase in nuclear charge tends to pull electrons closer to the
nucleus.
(c) Electronegativity increases from left to right in period.
(d)valency is different for all elements in the group.​

Answer 1

Explanation:

In general, atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant. ... Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital.

Hope this answer is helpful for u

Answer 2

Answer:

(B)Increase in nuclear charge tends to pull electrons closer to the nucleus

Explanation:

as we move from left to right in a period each electron gets on adding as the atomic no. increases by 1