00:01
Hi there.
00:02
Most of these configurations have a problem, starting with number 16.
00:09
As we're looking at number 16 after 4s2, they have 4d10.
00:17
But what should come after 4s2 is 3d10.
00:22
So this is violating the outfow principle, which says that electrons should fill into the orbitals in order of lowest energy upward.
00:33
So the alfail principle is violated there.
00:36
Looking at number 17, what we notice there in number 17 is we see a 3s3.
00:46
A 3s3 is not possible because s is just a single orbital.
00:52
And polly said that no more than two electrons can occupy any orbital.
01:02
So this is violating polly's rule, polly's exclusion principle.
01:12
Okay, for number 18.
01:13
Number 18 has a problem with the ra in brackets...