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

Correct answer: (c) It has 18 vertical columns known as Groups.

Explanation: In the modern periodic table, there are 18 vertical columns known as groups.

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Updated on: 10-Oct-2022

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