In the periodic table, vertical columns of elements are called ..... and horizontal rows of elements are called .....

Groups, periods

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Periods, groups

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Periods, periods

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Groups, groups

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Solution

The correct option is A Groups, periods
A modern version, the so-called “long-form” of the Periodic Table of the elements is the most convenient and widely used.

The horizontal rows ( which Mendeleev called series) are called periods and the vertical columns are called groups.

Option A is correct.

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