They are put into periods based on their number of electron shells.
The elements on the periodic table are separated into periods based on the number of electron shells they have. Elements in the same period have the same number of electron shells, which influences their chemical properties and reactivity.
In the periodic table chemical elements are orderd in periods and groups.
Horizontal rows are called periods. There are 7 periods in periodic table.
Horizontal rows are called periods. There are 7 periods in periodic table.
each row in the Periodic Table is called a period.
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.
The rows of elements in the periodic table are called periods. There are a total of 7 periods in the periodic table, each representing a different energy level or shell in which the elements' electrons are arranged.
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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.
It is named The PERIODIC TABLE. The periods being the horizontal rows The groups being the vertical columns.