Q30 / 200 · Manipal (MET) 2012 · Chemistry
For the valence electron in copper, the four quantum numbers are
- Correct answerA$n=4, l=0, m=0, s=\frac{1}{2}$
- B$n=4, l=0, m=+2, s=\frac{1}{2}$
- C$n=4, l=1, m=+2, s=\frac{1}{2}$
- D$n=4, l=1, m=0, s=\frac{1}{2}$
Solution
$\begin{aligned}
{ }_{29} \mathrm{Cu} & =2,8,18,1 \\
& =1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^{10}, 4 s^1
\end{aligned}$
$\therefore$ Quantum numbers for $4 s^1$ electron are
$n=4, \quad l=0, \quad m=0, s=+\frac{1}{2}$
Hence, the correct answer is option: 'A'.