Question

Which of the following statements about the Modern Periodic Table is correct: 

(a) It has 18 horizontal rows known as Periods 

(b) It has 7 vertical columns known as Periods 

(c) It has 18 vertical columns known as Groups 

(d) It has 7 horizontal rows known as Groups

Answer 1

The answer is (c) It has 18 vertical columns known as Groups

• Modern periodic table have 18 groups and 7 periods. 
• Columns are called groups and rows are called periods.