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Question
Which of the following statement 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.
In the modern periodic table, there are 18 vertical columns known as groups.
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