Question

In the modified Mendeleev's periodic table,____ group and____periods are present, whereas in the modern periodic table,____groups and____periods are present, respectively:

• A. 9, 8, 18, 7
• B. 7, 9, 18, 7
• C. 9, 7, 18, 8
• D. 8, 7, 18, 7

Answer 1

The correct option is D 8, 7, 18, 7

In the modified Mendeleev's periodic table, 8 groups and 7 periods are present, whereas in modern periodic table, 18 groups and 7 periods are present, respectively.