Question

8.
Explain the trends in Atomic Radius (size) across the period & down the group.​

Answer 1

Answer:

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Explanation:

The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase. 2) As you move across a period, atomic radius decreases.

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Answer 2

TRENDS IN ATOMIC RADIUS ACROSS THE PERIOD :

➡️ Atomic radius decreases across a period.

Because within the period, the outer electrons are in the same valence shell and the effective nuclear charge increases resulting in the increased attraction of electrons to nucleus.

TRENDS IN ATOMIC RADIUS DOWN THE GROUP :

➡️Atomic radius increases down the group.

Because down the group, electrons are added to the next energy level due to which the inner energy levels filled with electrons serve to shield the outer electrons from pull of nucleus.