Medium
In $Sr$ $(Z=38)$,the number of electrons with $l=0$ is $x$,and the number of electrons with $l=2$ is $y$. The value of $(x-y)$ is equal to:
($l=$ Azimuthal quantum number)
($l=$ Azimuthal quantum number)
- A$0$
- B$8$
- C$-2$
- D$2$
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