Question

Q. How many horizontal rows are there in the modern periodic table and what are they called......?

Answer 1

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There are 7 horizontal rows in the modern periodic table. They are called periods.

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Answer 2

Answer:

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In the periodic table of elements, there are seven horizontal rows of elements called periods. The vertical columns of elements are called groups, or families. The most common way the periodic table is classified by metals, nonmetals, and metalloids.

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