Question

Which of the following is not correct for a group in Mendeleev’s periodic table ?

• A. There are nine groups including zero group.
• B. All the groups are divided into sub groups.
• C. The group number of element represents its valency.
• D. The group number of element represents its position in periodic table.

Answer 1

Answer: (B)

(a) is correct because the groups are arranged from I to VIII including zero group.
(b) is incorrect because VIII group is not divided into sub groups.
(c) is correct.
(d) is correct.