RRB JE Stage I Exam 25 May 2019 Shift 1

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Question : 52 of 100

Marks: +1, -0

Which of the following statements about the modern periodic table is CORRECT?

It has 18 vertical columns known as groups
It has 18 horizontal rows known as periods
It has 7 horizontal rows known as groups
It has 7 vertical columns known as periods

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