Answer
See explanation.
Work Step by Step
Referring to table 41.3 as requested, gallium has the same electronic configuration as zinc, plus an extra electron that goes into the 4p subshell.
The electron configuration of Ga is
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^1$.
If one electron is taken away from neutral gallium, we return to zinc’s electronic configuration.
The electron configuration of Ga+ is
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2$.
If one electron is added to neutral gallium, the new electron is another 4p electron.
The electron configuration of Ga- is
$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^2$.
