English group 13 group 13 group 13 group 13 English group 13 (boron group) III English The Boron Family English English English group 13 English group 13 group 13 element Boron group English Group 13 Elements – The Boron Family III boron group group 13 (boron group) English boron group group 13 en:Boron group view article group 13 boron group group 13 13 (elemento de grupo 13) English group 13 (boron group) English English group 13 (boron group) English group 13 English English group 13 English boron group trivalent (number of valence electrons=3) English English English group III element English group 13 group 13 English