ɡˈæliəm ɪz ðə lˈaɪɾɪst ɡɹˈuːp θˈɜːtiːn mˈɛɾəl wɪð ɐ fˈɪld dˈiːʃˈɛl, ænd hɐz ɐn ᵻlɛktɹˈɑːnɪk kənfˌɪɡjɚɹˈeɪʃən ʌv ˈɑːɹ θɹˈiː dˈiː tˈɛn fˈoːɹ z tˈuː fˈoːɹ pˈiː wˈʌn bᵻlˌoʊ ðə vˈeɪləns ᵻlˈɛktɹɑːnz ðæt kʊd tˈeɪk pˈɑːɹt ɪn dˈiːpˈaɪ bˈɑːndɪŋ wɪð lˈɪɡændz.
Gallium is the lightest group 13 metal with a filled d-shell, and has an electronic configuration of ([Ar] 3d10 4s2 4p1) below the valence electrons that could take part in d-π bonding with ligands.