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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
MCQ
For an element with atomic number $19$, the $19$th electron will occupy:
  • A
    $L-$shell
  • ✓
    $M-$shell
  • C
    $N-$shell
  • D
    $K-$shell
✓

Answer

Correct option: B.
$M-$shell
Atomic number $= 19$
Electrons per shell $⟶ 2, 8, 9$
Maximum Electrons in $K = 2$
Maximum Electrons in $L = 8$
Maximum Electrons in $M = 18$
$\therefore 19$th electron will occupy $M−$shell.

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