The horizontal rows are called periods
Periods
Horizontal rows are called periods. There are 7 periods in periodic table.
a horizontal row is called a period.a vertical row is called a group
A period is a row of elements on the periodic table.
The horizontal rows on the periodic table are periods. Groups are the vertical columns on the periodic table.
The horizontal rows of the periodic table are called Periods and the vertical rows are called groups.
Horizontal rows are called periods. There are 7 periods in periodic table.
A horizontal row on the periodic table of elements is called a period.
a horizontal row is called a period.a vertical row is called a group
A period is a row of elements on the periodic table.
The horizontal rows on the periodic table are periods. Groups are the vertical columns on the periodic table.
The Horizontal row on the table is called a period
period
Period 3 is the 3rd horizontal row. It is the 3rd row in periodic table.
periods
The period is the horizontal row.
Periods
Period