Question

Which of the following statements about the Modern periodic table is correct ?

a) 18 horizontal rows are known as Periods.

b) 7 vertical columns are known as Periods.

c) 18 vertical columns are known as groups.d) 7 horizontal rows are known as Periods.​

Answer 1

Answer:

c)

Explanation:

In a perioic talble 18 columns and 7 rows are there

Answer 2

Answer:

b. 7vertical columns are known as period.