Interpretation:
The reason for decrease in atomic radius on moving across a period needs to be determined.
Concept introduction:
The atomic radius of a particular element is the measure of the atoms size. It can also be defined as the distance between its boundary and nucleus of the element

Explanation of Solution
On moving from left to right across a period, the atomic radius tends to decrease as the attractive forces within the atom increases.
This is because oppositely charged particles are added at the same principle energy level.
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