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Post Test: Atoms and Elements
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Select the correct answer from each drop-down menu.
Much of the mass of an atom is concentrated in its nucleus. The nucleus contains
. and the outer part of the atom contains
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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.