We’re being asked to determine the four quantum numbers most likely associated with the one-electron lost in going from Ga to Ga +
Recall that the quantum numbers that define an electron are:
• Principal Quantum Number (n): deals with the size and energy of the atomic orbital.
The possible values for n are 1 to ∞.
• Angular Momentum Quantum Number (l): deals with the shape of the atomic orbital.
The possible values for l are 0 to (n – 1).
• Magnetic Quantum Number (ml): deals with the orientation of the atomic orbital in 3D space.
The possible values for ml is the range of l: –l to +l.
• Spin Quantum Number (ms): deals with the spin of the electron. The possible values for ms are either –1/2 (spin down) or +1/2 (spin up).
The four quantum numbers most likely associated with the one electron lost in going from Ga to Ga + are:
(a) 4, 0, 0, +1/2
(b) 3, 2, 1, +1/2
(c) 3, 2, 1, -1/2
(d) 4, 2, 0, +1/2
(e) 4, 1, -1, +1/2
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