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

Answer:

c.it has 18 vertical columns known as groups

Answer 2

(c) It has 18vertical columns known as groups.

groups has same outer configuration same