Question

Which of the following statement about modern periodic table is correct?

• A. It has 18 horizontal rows known as periods.
• B. It has 18 vertical columns known as groups.
• C. It has 7 vertical columns known as periods.
• D. It has 7 horizontal rows known as groups.

Answer 1

The correct option is B

It has 18 vertical columns known as groups.

Long form of the periodic table is a chart of elements in which the elements have been arranged in the increasing order of their atomic numbers. This table consists of 7 horizontal rows called periods and 18 vertical columns called groups.