Question

In Mendeleev’s periodic classification, what is the number of groups?

(a) 12

(b) 8

(c) 7

(d) 6

The question was posed to me in an international level competition.

My question comes from Genesis of Periodic Classification topic in portion Classification of Elements and Periodicity in Properties of Chemistry – Class 11

Answer 1

Correct answer is (b) 8

The explanation is: A Russian chemist named Dmitri Mendeleev classified elements based on chemical and physical properties in ascending order of their atomic weights. The number of groups was 8 and there were 12 series.