# Question #fd400

Oct 13, 2016

$l = 2$

#### Explanation:

The angular momentum quantum number, $l$, is used to denote the subshell in which a given electron resides in an atom.

The value of the angular momentum quantum number depends on the value of the principal quantum number, $n$, as given by

$l = \left\{0 , 1 , 2 , \ldots , n - 1\right\}$

Now, in order for an electron to be located in a $d$ orbital, it must be located in the $d$ subshell. The angular momentum quantum number designates

• $l = 0 \to$ the s subshell
• $l = 1 \to$ the p subshell
• $l = 2 \to$ the d subshell
• $l = 3 \to$ the f subshell

In your case, all the electrons located in a $d$ orbital will share the same value of the angular momentum quantum number, i.e. $l = 2$.