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Periodic Classification of Elements — Science STD 10 — Question

Maharashtra BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
MCQ
Five elements $\ce{A, B, C, D}$ and $\ce{E}$ have atomic numbers of $2, 3, 7, 10$ and $18$ respectively. The elements which belong to the same period of the periodic table are:
  • A
    $\ce{A, B, C}.$
  • ✓
    $\ce{B, C, D}.$
  • C
    $\ce{A, D, E}.$
  • D
    $\ce{B, D, E}.$
✓

Answer

Correct option: B.
$\ce{B, C, D}.$
$B, C$ and $D,$ with atomic numbers $3, 7$ and $10$ respectively, belong to the same period of the periodic table. This is because the elements $B, C$ and $D$ have the same valence shell $(L$ shell$).$

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