Question

why is lithium atom smaller than potassium atom?​

Answer 1

$\huge\sf{Answer}$

(i) Potassium possesses more number of valence shells than lithium, so lithium is smaller than potassium atom. As it is clear, that chlorine is placed after sulphur so it has a smaller size and thus, its tendency to gain electron is- more than S. Hence, Cl is more electronegative than S.