Atomic Radius Trend
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Atomic radius decreases across a period as rising Zeff pulls electrons inward, and increases down a group as added shells outweigh it.
Show
Across a period, added protons raise Zeff faster than shielding, drawing outermost electrons closer to the nucleus.
Watch for
Atomic radius does not track atomic number alone — within a period, more protons shrink the atom rather than expand it.