Question

The number of groups and periods in the modern periodic table respectively, are: 1 (A) 7 and 9 (B) 18 and 7 (C) 7 and 18 (D) 9 and 7.

Answer 1

Answer:

B)18 and 7

Explanation:

There are eighteen vertical columns known as groups in the modern periodic table which are arranged from left to right and seven horizontal rows which are known as periods.