The correct answer is D. they all have the same number of electrons in the outer shell. Elements in the same group (or column) of the periodic table share similar chemical properties because they have the same number of valence electrons, which determines how they interact with other elements. This similarity in valence electron configuration leads to comparable reactivities and bonding behavior among the elements in a group.
Why do elements that are in the same group of the periodic table share similar properties? A. they all have the same atomic mass. B. they are all metals. C. they are all very reactive with other elements. D. they all have the same number of electrons in the outer shell.
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