Question

The general trend in the radius of an atom moving down a group is partially accounted for by the?

Answer 1

there are 2 opposing factor
1) increase in no of protons which decreases the size
2)formation of another subshell
experimentally it was found size increases so we say 2 factor dominates

Answer 2

Radius of the atom moving down a group is partially accounted for by Atomic Radii.

Normally, Atomic Radii could not be measured directly as Electron Cloud surrounding nucleus does not have clear ability.

Increase down a group, decrease across a period with Group and Period Trends in Atomic Radii.

Shielding the outer electrons with inner electrons have Radius of atom moving down a group is partially accounted.