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} are the range of l: **–l to +l**.

What information is needed to determine the energy of an electron in a many-electron atom? Check all that apply.

a) *n*

b) ℓ

c) *m _{l}*

d) *m _{s}*

What information is needed to determine the orientation of orbital?

a) *n*

b) ℓ

c) *m _{l}*

d) *m _{s}*

What information is most important in determining the size of an orbitaI?

a) *n*

b) ℓ

c) *m _{l}*

d) *m _{s}*

What information is needed to determine the general shape of an orbital?

a) *n*

b) ℓ

c) *m _{l}*

d) *m _{s}*

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