Question

Scientific reason of atomic radius goes on decreasing while going fro. Left to right in a period

Answer 1

Nuclear charge dominates whilst adding electrons to the same shell. The net result is atomic contraction across a period.

Explanation:

This is a very important periodic phenomenon: the contraction of atomic radii across the period. While as we add to Z (the number of protons in the nucleus), we also add another electron (and charge is therefore kept neutral), the increased nuclear charge acts disproportionately on the valence electrons, and contracts this shell.