Rows
The horizontal rows on the periodic table are called periods.
The horizontal rows of elements in the periodic table are called periods.
These horizontal rows are called periods.
The horizontal rows of the periodic table are called Periods and the vertical rows are called groups.
The horizontal rows on the periodic table are called periods.
The horizontal rows on the periodic table are called periods.
The horizontal rows of elements in the periodic table are called periods.
The horizontal rows are called periods
The horizontal rows are periods on periodic table. There are 7 horizontal rows in modern periodic table.
These horizontal rows are called periods.
The horizontal rows on the periodic table are called periods.
rows. the vertical columns are called periods
The rows (Horizontal) are called Periods and the Columms (Vertical) are called Groups.
The horizontal rows on the periodic table are called periods.
The horizontal rows of the periodic table are called Periods and the vertical rows are called groups.
The horizontal rows are known as periods.
The horizontal rows on the Periodic Table are called periods.