In Mendeleev’s periodic table, the vertical columns are called and horizontal rows are referred to as .

groups

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periods

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Solution

The correct option is B periods
Mendeleev’s periodic table has 8 groups and 6 periods in total.
The vertical columns are known as groups and the horizontal rows are known as periods.

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Horizontal rows in the periodic table are called:

What are the horizontal rows in the periodic table called?

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