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.​

Answer 1

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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.

Answer 2

Answer:

In general, atomic radius decrease across a period increases down a group. Across a period,

effective nuclear change increase as electron shielding remains contact. Down a group, the number of energy level (N) increase, so there is a great greater distance between the nucleus and the outermost orbital.