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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
MCQ
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
  • A
    A, B, C.
  • ✓
    B, C, D.
  • C
    A, D, E.
  • D
    B, D, E.
✓

Answer

Correct option: B.
B, C, D.
The elements B(Z = 3), C(Z = 7) and D(Z = 10) belong to the same period. It is second period.

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