# Question #3d416

Apr 14, 2017

Here's what I get.

#### Explanation: (a) 3 0 0

$n = 3$ tells you that this is the third energy level and $l = 0$ tells that it is an $\text{s}$ orbtal.

Together they tell you that this is a $\text{3s}$ electron.

(b) 2 1 1

The principal quantum number $n = 2$ tells you that this is the second energy level and $l = 1$ tells you that it is a $\text{p}$ orbital.

Together they tell you that this is a $\text{2p}$ electron.

The magnetic quantum number ${m}_{l} = 1$ tells you the orientation of the orbital in a magnetic field.

Thus the electron is in one of the three $\text{3p}$ orbitals.

(c) 4 2- 1

Impossible! You cannot have $l = \text{-2}$.

The allowed values go from $l = 0$ to $n - 1$ (i.e. $l = 0 , 1 , 2 , 3$)

(d) 3 3 2

Impossible! You cannot have $l = \text{3}$.

The allowed values go from $l = 0$ to $n - 1$ (i.e. $l = 0 , 1 , 2$)

(e) 3 1 2

Impossible! You cannot have ${m}_{l} = \text{2}$.

The allowed values of ${m}_{l}$ go from $\text{-} l$ to $\text{+} l$ (i.e. ${m}_{l} = - 1 , 0 , 1$).