関連ワード:
elements in the same period have the same valence electrons do elements in the same period have the same valence electrons elements in the same period have the same number of valence electrons elements in the same period have the same number of valence electrons true or false do elements in the same period have the same number of valence electrons all elements in the same period have the same number of valence electrons do all elements in the same period have the same number of valence electrons elements in the same group or period have the same number of valence electrons elements in the same period of the periodic table have the same number of valence electrons elements in the same row period of the periodic table have the same number of valence electrons
