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Each period corresponds to a principal energy level. it is arranged in order of increasing atomic mass. All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons.

The row or period of the periodic table corresponds to the energy level of the elements.

The periodic table of elements is arranged in rows and columns.

The columns corresponds to the groups of the elements, which determines the chemical properties of the elements. In other words, elements found in the same group in the periodic table have similar chemical properties.

The row or period of the periodic table corresponds to the energy level of the elements. Elements in the same period have the same number of shells and energy level.

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