Structure of Atom - Result Question 53
####57. For which one of the following sets of four quantum numbers, an electron will have the highest energy?
[1994]
\begin{tabular}{rrrrr} & $n$ & $l$ & $m$ & $s$ \\
(a) & 3 & 2 & 1 & $1 / 2$ \\
(b) & 4 & 2 & -1 & $1 / 2$ \\
(c) & 4 & 1 & 0 & $-1 / 2$ \\
(d) & 5 & 0 & 0 & $-1 / 2$ \end{tabular}
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Solution:
- (b) The sub-shell are $3 d, 4 d, 4 p$ and $5 s, 4 d$ has highest energy as $n+l$ value is maximum for this.
