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14. Which of the given elements A, B, C, D, and E with atomic number 3, 11, 15, 18, 19respectively belong to the same group?(a) A, B, C(b) B, C, D(C) A, D, E(d) A, B, E |
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Answer» Answer: For B, C, D, the SECOND SHELL is being FILLED, so they belong to the second PERIOD. For E, the fourth shell is being filled, so it belongs to the fourth period. So B, C, D belong to the same period. Therefore, the CORRECT answer is option (B). |
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