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.