Question
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, B, C.
- B, C, D.
- A, D, E.
- B, D, E.
✓
Answer
- B, C, D.
Solution: 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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