Which of the following statements about valence electrons and the periodic table is true?
a)...
Which of the following statements about valence electrons and the periodic table is true?
a) the number of valence electrons decreases from left to right across each period. b) the number of valence electrons increases from top to bottom within each group.
c) all of the elements in group 9 have nine valence electrons.
d) elements with the most valence electrons are in group 18.
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