The radius of carbon atom is — Solid State Chemistry Question

💡 Solution & Explanation

For diamond ($Z=8$), $d = 3.6 = \frac{8 \times 12}{N_A \times a^3} \implies a \approx 3.53$ Å. In diamond, nearest C-C distance $2r_C = \frac{\sqrt{3}a}{4} = \frac{1.732 \times 3.53}{4} \approx 1.53$ Å. Radius $r_C = 1.53 / 2 \approx 0.765$ Å. Therefore, correct answer is A.