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)**.

Select the acceptable sets of quantum numbers in an atom.

a.) (2, 2, 1,+1/2)

b.) (3,2,1,1)

c.) (1, 0, 1/2, 1/2)

d) (4, 3, -2, +1/2)

e.) (3, 0, 0, +1/2)

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