Question

Which of the given elements A, B, C, D and E with atomic number2, 3, 7, 10 and 30 respectively belong to the same period?

1)A, B, C
2)B, C, D
3)A, D, E
4)B, D, E

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Answer 1

Answer:

1)

Explanation:

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Answer 2

Answer. At no. of elements a,b,c,d,e are 2,3,7,10,30. Elements b , c , d belongs to the same period because the no.

So.1)