The rows of the periodic table are called:
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Lines
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Rows
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Periods
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Symbols
C
Correct answer
Explanation
The horizontal rows in the periodic table are called 'periods'. There are 7 periods in the modern periodic table. Elements in the same period have the same number of electron shells, which is why properties change gradually as you move across a period. The vertical columns are called 'groups' or 'families'.