The electrons, identified by quantum numbers and , (i) (ii) (iii) (iv) can be placed in order of inc — Atomic Structure Chemistry Question
Question
The electrons, identified by quantum numbers $n$ and $l$, (i) $n = 4, l = 1$ (ii) $n = 4, l = 0$ (iii) $n = 3, l = 2$ (iv) $n = 3, l = 1$ can be placed in order of increasing energy, from the lowest to highest, as
Answer: A
💡 Solution & Explanation
Energy depends on $(n+l)$ value. (i) $4+1 = 5$. (ii) $4+0 = 4$. (iii) $3+2 = 5$. (iv) $3+1 = 4$. For same $n+l$, lower $n$ has lower energy. (iv) < (ii) since $3<4$. For $n+l=5$, (iii) < (i) since $3<4$. Overall order: iv < ii < iii < i. Therefore, correct answer is A.
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