Chemistry, 13.07.2019 19:00 brookesquibbs
Which statement about the elements in the periodic table is true? a) the number of valence electrons increases as atomic mass increases. b) the reactivity of alkali metals increases as atomic mass increases. c) the number of valence electrons decreases across a period. d) the reactivity of the halogens increases as atomic mass increases.
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Which statement about the elements in the periodic table is true? a) the number of valence electron...
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