1.

Which of the following statement is not correct

Answer»

Atomic no. of A, B, C are 40,57, 105 resp.
Group no of A, B, C are IV B, III B and V B respectively
Period no of A, B, C are, `4^(th), 5^(th) and 6^(th)` resp.
C is a radioactive element

Solution :
A = 40, B = 57, C = 105


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