Question

what is the size of atimc radius as we move from left to right across a period

Answer 1

Atomic radius decreases from left to right across a period

Answer 2

The atomic radius decreases as we move from left to right across a period of periodic table

Across a period the valence electrons and the number of protons in the nuclei of atoms of elements increase.

The added electrons do not completely screen the other electrons from the attraction of the extra protons.

Thus, the nuclei pull the electrons with gradually increasing force and that cause Decrease in atomic radii