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Question 6 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) B, C, D (c) A, D, E d) B, D, E

Answer» Question 6
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) B, C, D
(c) A, D, E
d) B, D, E


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