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OpenStudy (anonymous):

Which of these pairs of elements have the same number of valence electrons? oxygen (O) and bromine (Br) selenium (Se) and bromine (Br) carbon (C) and lead (Pb) oxygen (O) and carbon (C) sodium (Na) and magnesium (Mg)

OpenStudy (anonymous):

Carbon and Lead are in the same group (4) thus they have the same number of valence electrons.

OpenStudy (jfraser):

which pair of elements come from the same column (family) on the periodic table?

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