Answer:
1s22s22p63s23p64s23d104p1
Explanation:
Gallium is a member of group 13 in the periodic table. It is the element that follows aluminium in the table.
Being in group 13, it has the outermost electron configuration of ns2np1. The full electronic configuration of gallium is; 1s22s22p63s23p64s23d104p1
Note that the last shell in gallium is the fourth shell (n=4) where the three outermost electrons (4s24p1) are found.