1)mass 2)electronegativity3)total number of protons 4)total number of valence electrons
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4)total number of valence electrons both are in group 13 and therefore have three valence electrons -FOLLOW UP- the carbon talkies is incorrect because electronegativity is related to effective nuclear chargeAluminum and gallium have different nuclear charges and atomic radii, so by no means do they have the same electronegativityLike i stated, both are in group 13 and therefore have three valence electrons and therefore the same number of valence electrons.
