They are put into periods based on their number of electron shells.
The Periods are the horizontal rows on the periodic table.
In the periodic table chemical elements are orderd in periods and groups.
Horizontal rows are called periods. There are 7 periods in periodic table.
there are 7 periods in the periodic table118
Horizontal rows in Periodic Table are called Periods
The horizontal rows of elements in the periodic table are called periods.
There are 18 periods in the periodic table. The periods are divided according to the chemical properties of elements. Elements in a group have similar properties.
each row in the Periodic Table is called a period.
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Elements are arranged on the Periodic Table in the order of the atomic number, in groups and periods.
The horizontal rows are periods on periodic table. There are 7 horizontal rows in modern periodic table.
The periodic table of Mendeleev contain now 118 chemical elements arranged in groups and periods.