Which of the following is not a rule for filling electrons...

Which of the following is NOT a rule for filling electrons in an atomic orbital? Group of answer choices An electron always goes into the available orbital with the lowest energy When filling orbitals of equivalent energy, an electron will pair first before moving to another orbital Electrons within the same orbital will have opposite spin. The maximum number of electrons an orbital can hold is two.

Transcript

00:02 Hi there.

00:03 This question is about huns rule.

00:09 And huns rule says that when electrons are entering orbitals, if we have multiple orbitals of equal energy, electrons will enter one to each of the empty orbitals before doubling up.

00:24 So let's try to put that in words.

00:28 Electrons will be placed into orbitals of equal energy, one at a time before doubling up.

01:07 So as an again, let's talk about maybe we want to show 2p4.

01:17 What we know for p orbitals, there are three orbitals of equal energy.

01:26 So here are my three two p orbitals.

01:28 Again, they have equal energy.

01:31 So as we are putting electrons into these, the first one goes into an empty orbital.

01:36 The second one can either go into that first orbital with the first electron, or it can go to an empty one.

01:42 And this is what hund is saying is that that next electron will choose the empty orbital, and it will have the same spin as that first electron.

01:53 The third electron will then go into the third empty orbital, again with the same spin.

01:59 And then for the fourth electron, now we don't have a choice.

02:03 Now they will start doubling up, because we can only put a maximum of two in each one.

02:07 So this is what huns rule is saying, is that two of these electrons will be unpaired in this situation.

02:14 Or in any situation where we are putting multiple electrons into orbitals that have the same energy...

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