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2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
The number of electrons present in all the completely filled subshells having $\mathrm{n}=4$ and $\mathrm{s}=+\frac{1}{2}$ is)______________.  (Where $\mathrm{n}=$ principal quantum number and $\mathrm{s}=$ spin quantum number)
  • A
    $14$
  • B
    $35$
  • C
    $18$
  • ✓
    $16$
✓

Answer

Correct option: D.
$16$
d
$n=4$ can have,

  $4s$ $4q$ $4d$ $4f$
Total $e^-$ $2$ $6$ $10$ $14$
Total $\mathrm{e}^{-}$with $\mathrm{S}=+\frac{1}{2}$ $1$ $3$ $5$ $7$

So, Ans.$16$

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