Why does atomic radius increase from top to bottom in a chemical family?
a. Effective nuclear charge increases from top to bottom in a chemical family.
b. Effective nuclear charge decreases from top to bottom in a chemical family.
c. The number of energy levels increases from top to bottom in a chemical family.
d. The number of energy levels decreases from top to bottom in a chemical family.
e. The number of electrons decreases from top to bottom in a chemical family.
