In the ground state #"Kr"# atom, how many electrons have the quantum number #m_l = -2# ?
1 Answer
Two electrons.
Explanation:
First of all, you should know that the magnetic quantum number,
The values that the magnetic quantum number can take depend on the values of the angular momentum quantum number,
Now, we know that
#m_l = {-l, -(l-1), ..., -1, 0, 1, ..., (l-1), l}#
This implies that in order to be able to have
#m_l = -2#
you need to have
#l >=2#
As you know, the angular momentum quantum number can take the following values
#l = 0 -># describes the#s# subshell#l = 1 -># describes the#p# subshell#l = 2 -># describes the#d# subshell
#vdots#
and so on. For the
#m_l = { -2, -1, 0, 1, 2}#
This means that you're looking for
- the nubmer of
#d# subshells that contain electrons in a neutral atom of krypton in its ground state- the number of electrons located in one the five
#d# orbitals present for every#d# subshell that contains electrons
Now, krypton, which is located in period
#"K: " 1s^2 2s^2 2p^6 3s^2 3p^6 ul(3d^10) 4s^2 4p^6#
As you can see, a neutral atom of krypton has
Since the
This implies that a total of
Depending on what naming convention you use, you can say that these two electrons will be located, for example, in the