MCQ
The valence electrons of magnesium is different in $...........$ quantum number.
- A$m$
- B$n$
- C$l$
- ✓$s$
✓
Answer
Correct option: D.
$s$
The configuration of magnesium is $\ce{1 s^2 2 s^2 2 p^6 3 s^2}$.
The outermost electron is in $s$ orbital and is paired.
Therefore, for the two electrons in $3\ s$ orbital, only $s,$ spin quantum number is different.
The outermost electron is in $s$ orbital and is paired.
Therefore, for the two electrons in $3\ s$ orbital, only $s,$ spin quantum number is different.
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