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CBSE Notes 2011-2012

Which of the given elements A, B, C, D and E with atomicnumber 2, 3, 7, 10 and 30 respectively belon...

Multiple choice question

Which of the given elements A, B, C, D and E with atomicnumber
2, 3, 7, 10 and 30 respectively belong to the same
period ?

unknown

A. B, C

unknown

B, C, D

unknown

A, D, E

unknown

B, D, E