As you move from left to right across the periodic table __. Question options: The atoms become more reactive. The number of electron shells on the atom increase. The atoms decrease in mass. The number of valence electrons on the atom increase.
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Home » Chemistry » As you move from left to right across the periodic table __. Question options: The atoms become more reactive. The number of electron shells on the atom increase. The atoms decrease in mass. The number of valence electrons on the atom increase.