Recall that the ** quantum numbers** 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}**)**: describes the electron spin

- There are only two possible values:
**+½ (spin up electron)**or**–****½ (spin down electrons)**

What does the principal quantum number determine? Check all that apply.

a) the energy of an orbital

b) the possible number of electorns on particular orbital

c) the overall size of an atom

d) the overall size of an orbital

e) the shape of the orbital

f) the energy of the electron on the outer shell

g) the orientation of the orbital

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