Which of the following statements regarding the modern periodic table is correct?
A. It consists of 18 vertical columns, which are called groups
B. It consists of 7 horizontal rows, which are called groups
C. It consists of 18 horizontal rows, which are called period
D. It consists of 7 vertical column, called period
Answer: Option A
This Question Belongs to Chemistry GK Chapter Wise >> Periodic Classification Of Elements
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