Question

Why does atomic radii decrease as you move from the left to right across the period

Answer 1

When we move from left to right across the periodic table, we can see that the atomic radii keeps decreasing. This is because, as you move from left to right, the nucleus gains protons. The atomic number increases and hence the valence electron will feel more attracted towards the nucleus & the atomic radii will decrease.

$\mathbb{MIREU}$

Answer 2

Answer:

This is because, within a period or family of elements, all electrons are added to the same shell.