Electronic configuration of Potassium is 2,8,8,1 and Calcium 2,8,8,2,
when M shell can have maximum of 18 electrons then why next element
Scandium has electronic configuration 2,8,9,2 and not 2,8,8,3?
Answers
Answer:
This is because......
In any she'll maximum no. Of electron is always according to 2n2
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 the last shell, only 2 electrons can be filled and it will not increase until the previous shell are completely filled.
I am giving you an example......
Calcium has atomic no. 20 so it's electronic configuration is
In the first shell - 2. (max. Is 2)
In the second shell - 8. (max is 8)
In third shell - 8 (max is 18)
In the fourth shell - 2. (max is 32).
As you can see in second shell first 8 electrons are filled then 2 electrons are filled in the next shell.
But in case of scandium as you have asked.....
Scandium has atomic number 21 so its electronic configuration is
In the first shell - 2. (max is 2)
In the second shell - 8. (max is 8)
In the third shell - 9. (max is 18)
In forth shell - 2. (max is 32).
As here as you can see...
In forth shell 2 electrons is filled first then the remaining electrons are filled in the previous shell and when the previous shell, say the 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.
Hope you understood......
pls pls mark me as brain list......
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....