The ratio of spacing between the third and fourth orbit to the spacing between sixth and seventh orb — Atomic Structure Chemistry Question

💡 Solution & Explanation

Spacing between orbits $n$ and $m$ is proportional to $(m^2 - n^2)$. For 3rd and 4th: $4^2 - 3^2 = 16 - 9 = 7$. For 6th and 7th: $7^2 - 6^2 = 49 - 36 = 13$. Ratio is 7:13. Therefore, correct answer is A.