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 ***(m _{l})**: deals with the orientation of the atomic orbital in 3D space.

The possible values for m_{l} is the range of l: **–l to +l**.

• *Spin Quantum Number ***(m**_{s}**)**: deals with the spin of the electron. The possible values for m_{s} 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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