All the atoms of elements listed in each row of the periodic table have the same number of

electron shells

Explanation:

A period in the periodic table is a row of chemical elements. All elements in a period have have the same number of electron shells. Electrons in the atom are arranged in shells, the first shell allows 2 electrons, so if more electrons are present, a second shell is needed. The second shell allows 8 electrons, so if there are present more than 10 electrons, a third shell is needed (notice that 2 electrons go to the first level and 8 to second one). This reasoning is repeated for every other levels. All the atoms of elements listed in each row of the periodic table have the same number of electron shells.

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