Which of the following statements

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.

Solution:

(c) It has 18 vertical columns known as Groups

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