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Structure of Atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom1 Mark
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.

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