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Periods.
groups go vertically and periods are the horizontal rows
The horizontal rows on the periodic table are called periods.
The horizontal rows are periods on periodic table. There are 7 horizontal rows in modern periodic table.
rows. the vertical columns are called periods
The horizontal rows on the periodic table are called periods.
periodsThere are seven periods, or rows, on the Periodic Table.
Periods.
groups go vertically and periods are the horizontal rows
The horizontal rows on the periodic table are called periods.
The horizontal rows are periods on periodic table. There are 7 horizontal rows in modern periodic table.
The horizontal rows on the periodic table are called periods.
The rows (Horizontal) are called Periods and the Columms (Vertical) are called Groups.
rows. the vertical columns are called periods
The horizontal rows on the periodic table are periods. Groups are the vertical columns on the periodic table.
The horizontal rows are called periods, there are 7. The vertical rows are groups and there are 18.
The horizontal rows of elements in the periodic table are called periods.