Question

Which one has larger radius:

• A. $\text{N}{\text{a}}^{\text{+}}$
• B. $F$
• C. $O$
• D. $Na$

Answer 1

The correct option is D $Na$

Na has larger radii than $N{a}^{+}$ because Na has equal number of protons and neutrons while $N{a}^{+}$ has more number of protons than electron. Due to more number of proton effective nuclear charge increases in case of $N{a}^{+}$ that's why having smaller size. While oxygen and fluorine belongs to second period that's why they are smaller in size than Na.