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Question
Give scientific reasons for the following:
Atomic radius goes on decreasing while going from left to right in a period.
Solution
- While going from left to right within a period, the atomic number increases one by one, meaning the positive charge on the nucleus increases by one unit at a time.
- However, the additional electron gets added to the same outermost shell. Due to the increased nuclear charge, the electrons are pulled towards the nucleus to a greater extent and thereby the size of the atom decreases.
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