1.

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 ?

Answer»

`A,B, C`
`B, C,D`
`A,D, E`
`B, D,E`

Solution :Elements B (LI), C (N) and D (Ne) belong to the same GROUP.


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