Question

Q17. () 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.​

Answer 1

Answer:

The answer is

Explanation:

Answer: 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.

Therefore option a

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Answer 2

Answer:

Within a period, protons are added to the nucleus as electrons are being added to the same principal energy level. ... Since the force of attraction between nuclei and electrons increases, the size of the atoms decreases.

Explanation:

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