Answer
Sodium is larger. Remember atom size increases as you go down in groups (extra orbitals) and decreases as you move across a period (because of increased contraction from the inc number of protons pulling the electrons).
Work Step by Step
Sodium is larger. Remember atom size increases as you go down in groups (extra orbitals) and decreases as you move across a period (because of increased contraction from the inc number of protons pulling the electrons).
