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:C
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.