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What happens to the size of atoms of elements of p-block as we move from left to right in the same period?

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What happens to the size of atoms of elements of p-block as we move from left to right in the same period?

(a) Size increases

(b) Size decreases

(c) Size does not change

(d) Size increases then decreases

I had been asked this question in an interview for internship.

This interesting question is from P-Block topic in chapter P-Block Elements of Chemistry – Class 12

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Right choice is (b) Size decreases

Easiest explanation: The size of the atoms of the elements decrease from left to right in the same period. Considering the row to be the same, the electrons are added to the same shell. However, the increase in atomic number reflects the increase in number of protons i.e. the positive charge. Hence, the overall effective nuclear charge increases. Consequently, the electron cloud is pulled even more closer to the nucleus of the atom. Therefore, the size decreases.

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