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Question

Which of the given elements A, B, C, D and E with atomic number 2,3,7,10and30 respectively belong to the same period?


A

A, B, C

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B

B, C, D

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C

A, D, E

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D

B, D, E

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Solution

The correct option is B

B, C, D


Explanation for correct option:

B. B, C, D

  • The element with an atomic number 2 is HeliumHe which belongs to Group-18 and the first period.
  • The element with an atomic number 3 is LithiumLi and it belongs to Group-2 and the second period.
  • The element with an atomic number 7 is NitrogenN and it belongs to Group-15 and the second period.
  • The element with an atomic number 10 is NeonNe and it belongs to Group-18 and the second period.
  • The element with an atomic number 30 is ZincZn which belongs to Group-12 and the fourth period.

Thus, the elements that belong to the same period i.e. the second period are Lithium, Nitrogen, and Neon, and they are denoted as B, C, and D as per the question.

Explanation for incorrect options:

The given elements B, C, and D belongs to the same period. Thus options A, C, and D are incorrect.

Hence, the correct option is B i.e. B, C, and D


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