The electronic configuration of potassium is 2,8,8,1 and calcium 2,8,8,2 when M shell can have maximum 18 electrons then why the next element scandium has electronic configuration 2,8,9,2 and not 2,8,83 ??
Answers
Answered by
72
This is because....
In any she'll maximum no. Of electron is always according to
.
Where n is equal to no. Of shells.
It is not necessary that when the orbit is filled according to 2n^2, then only next orbit starts filling. When 8 electrons are filled in the orbit then next orbit starts filling, but in last shell, only 2 electrons can be filled and it will not increase until the previous shell are completely filled.
.
.
I am giving you example....
Clacium has atomic no. 20 so it's electronic configuration is
In first shell - 2. (max. Is 2)
In second shell - 8. (max is 8)
In third shell - 8 (max is 18)
In fourth shell - 2. (max is 32).
.
As you can see in second shell first 8 electrons are filled then 2 electrons are filled in next shell.
But in case of scandium as you have asked....
Scandium has atomic number 21 so its electronic configuration is
In first shell - 2. (max is 2)
In second shell - 8. (max is 8)
In third shell - 9. (max is 18)
In forth shell - 2. (max is 32).
.
As here you can see...
In forth shell 2 electron is filled first then the remaining electrons are filled in the previous shell and when the previous shell, say third shell when 18 electrons are filled then only forth shell starts filling further.
.
.
This point is very important when you are writing an electronic configuration of any element.
.
.
.
I Hope You Understand....
Thank you
In any she'll maximum no. Of electron is always according to
.
Where n is equal to no. Of shells.
It is not necessary that when the orbit is filled according to 2n^2, then only next orbit starts filling. When 8 electrons are filled in the orbit then next orbit starts filling, but in last shell, only 2 electrons can be filled and it will not increase until the previous shell are completely filled.
.
.
I am giving you example....
Clacium has atomic no. 20 so it's electronic configuration is
In first shell - 2. (max. Is 2)
In second shell - 8. (max is 8)
In third shell - 8 (max is 18)
In fourth shell - 2. (max is 32).
.
As you can see in second shell first 8 electrons are filled then 2 electrons are filled in next shell.
But in case of scandium as you have asked....
Scandium has atomic number 21 so its electronic configuration is
In first shell - 2. (max is 2)
In second shell - 8. (max is 8)
In third shell - 9. (max is 18)
In forth shell - 2. (max is 32).
.
As here you can see...
In forth shell 2 electron is filled first then the remaining electrons are filled in the previous shell and when the previous shell, say third shell when 18 electrons are filled then only forth shell starts filling further.
.
.
This point is very important when you are writing an electronic configuration of any element.
.
.
.
I Hope You Understand....
Thank you
Answered by
1
The electronic configuration of potassium is 2,8,8,1 and calcium 2,8,8,2 when M shell can have maximum 18 electrons then the next element scandium has electronic configuration 2,8,9,2 and not 2,8,8,3 because:
- All the atom always tend to have a stable electronic configuration.
- the distribution of electron in shells is known as the electronic configuration.
- its can be understand by modern configuration concept spdf.
- when s shell is filled in the scandium then the d shell is filled as per the aufbau principle.
- according to aufbau's principle electron are filled in increasing order of their energies
- Also we need to consider hund's rule according to which half filled or fully filled shells are more stable as compared to others.
#SPJ3
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