00:10
So what is question 71? what is electron configuration? electron configuration of an element in the distribution of electrons within the orbitals of its atom.
00:23
This write a role start the polling exclusion principle and hons rule play in writing the electron configuration of elements.
00:33
Polling exclusion principles say no two electrons in the same atom can have the same form, quantum numbers.
00:44
So what does it mean? we have four quantum number is n, l, m, and ms.
00:55
And now, for example, i get the first electron here, and the second electron.
01:06
So the first one get the quantum number n equal to, l equals zero, ml equals zero, and ms equal zero, and ms equal 1, less 1 half.
01:21
The second, get 2 ,00, the last 4 should be different, because 3 of them are the same already.
01:32
Now i get minus 1ā2.
01:34
Another example.
01:36
The first one for example, they get 1 -0 and plus 1 .5.
01:45
The second may be get plus 1ā2.
01:48
But this should be maybe the gas 0, 2 ,0, and the last one should be different, not one anymore, maybe 2, 3, 4, whatever, but one of them should be different.
02:08
And houndrusei when fuel the electron into degenerate orbitals, electrons feel them singly first with parallel spin.
02:19
And for example, i have the 2p2 orbital here.
02:24
2 p orbital get 2 orbital degenerate energy and now for example i got 3p 5 so this p get 5 electron so i get 4.
02:45
So i got 4...