periodic table

Question 1

atomic radii across period

Answer 1

atomic radii decreases

nuclear charge increases because number of protons increase successively from one element to the next across periodic table

number of inner electrons remain the same as successive electrons are added to the same principal quantum shell

efoa between nucleus and valence electrons increase

size of electron cloud decreases

Question 2

Atomic radii down group

Answer 2

atomic radii increases down the group

Inner principal quantum shell increases

Distance between valence electrons and nucleus increases

Efoa between valence electrons and nucleus decreases

Size of electron cloud increases