Question

In the periodic table from left to right in a period,
the atomic volume
(a) Decreases
(b) Increases
(c) Remains same
(d) First decrease then increases

Answer 1

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Answer 2

(d) First decrease then increases

Explanation:

When we go left to right in a periodic table, the atomic volume first decreases due to increase of nuclear charge. One proton has a greater effect than one electron, hence electrons are pulled towards nucleus, as a result atomic radius decreases and thus atomic volume decreases.

Later, the number of electrons in valence shell keeps increasing, which results in decrease of effective nuclear charge due to shielding effect. As a result atomic radius starts to increase, and consequently atomic volume increases.

Option D is the answer.