The similarities in the properties of a group of elements are because they have the same _____ (atomic number, electronic configuration, number of outer electrons ).

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Solution

The distribution of electrons in the outermost shell is called the valance shell electronic configuration of an atom. It is mainly responsible for the physical and chemical properties of an element. The elements belonging to the same group in the periodic table have the same valence shell electronic configuration.
So, the similarities in the properties of a group of elements are because they have the same number of outer electrons.

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