Chemistry, 27.07.2019 11:30, mleighaj9560
How are the periods, or horizontal rows, on a periodic table ordered from left to right? (2 points) by similar state of matter. by increasing number of protons. by decreasing number of neutrons. by similar number of valence electrons.
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How are the periods, or horizontal rows, on a periodic table ordered from left to right? (2 points)...