Question

why is lithium atom smaller than potassium atom ​

Answer 1

Answer:

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.

Answer 2

Answer:

Potassium possesses 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 .