Question

Which of the following statements is not correct about modified Mendeleev's periodic table?

• A. It consists of nine groups and seven periods.
• B. Group $VIII$ like group $I-VII $ has been divided into two sub-groups $A$ and $B$.
• C. The group of an element in the periodic table represents its valency.
• D. The elements of group $IB$ are called coinage metals.

Answer 1

Answer: (B)

Group $VIII$ consists of three triads such as $ Fe, Co, Ni; Ru , Rh , Pd$ and $Os, Ir, Pt$ arranged in $4^{\text {th }}, 5^{ th }$ and $6^{\text {th }}$ periods respectively.