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Question 25
On moving from left to right in a period in the periodic table, the size of the atom.


(a) increases
(b) decreases
(c) does not change appreciably
(d) first decreases and then increases


Solution

Option (b) is correct.
In a period, the size of an atom decreases from left to right. This is because of the nuclear charge, that is, the atomic number increases from left to right in the same period, thereby bringing the electrons closer to the nucleus.

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