The horizontal rows on the periodic table are periods. Groups are the vertical columns on the periodic table.
rows. the vertical columns are called periods
The horizontal rows are periods on periodic table. There are 7 horizontal rows in modern periodic table.
The Periods are the horizontal rows on the periodic table.
They are the horizontal rows in the periodic table
The horizontal rows on the periodic table are periods.
The horizontal rows are referred as periods. There are 7 periods in periodic table.
Horizontal rows are called periods. There are 7 periods in periodic table.
The horizontal rows of elements in the periodic table are called periods.
The horizontal rows on the periodic table are periods. Groups are the vertical columns on the periodic table.
The rows (Horizontal) are called Periods and the Columms (Vertical) are called Groups.
The horizontal rows on the periodic table are called periods.