## Octet Expansion

$sp, sp^{2}, sp^{3}, dsp^{3}, d^{2}sp^{3}$

Deepika Pugalenthi 1A
Posts: 60
Joined: Fri Sep 28, 2018 12:24 am

### Octet Expansion

Why is the d-orbital required for octet expansion?

Posts: 96
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 2 times

### Re: Octet Expansion

Starting from the third period, elements can expand their octet since there are more orbitals available. d orbitals are first available starting in the n=3 energy level. Once the s and p orbitals are filled in an energy level, the next available orbitals for the electrons are the d orbitals. The lowest energy orbitals available must be filled first, so the d orbitals are used to expand the octet before the electrons fill the orbitals in the next energy level.

Mark 1D
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

### Re: Octet Expansion

electrons fill up the s and p orbital. once those orbitals are filled, d orbital is needed for an atom to have more than 8 valence electrons

705192887
Posts: 77
Joined: Fri Sep 28, 2018 12:18 am

### Re: Octet Expansion

The d orbital is needed because it has an extra 10 electron capacity. s and p are filled up first and can only hold 8 (full octet), so the extra 10 from d orbital are used to exceed the octet.

leediane0916
Posts: 31
Joined: Fri Sep 28, 2018 12:29 am

### Re: Octet Expansion

up to period 2 elements, the electrons can only fill s and p orbitals which is why they can only pair up to 8 electrons. but starting from period 3, there is a d orbital that goes beyond just the s and p orbital which is why if the first two subshells are full, electrons can fill the d subshell, creating an expanded octet

Daniel Chang 3I
Posts: 33
Joined: Fri Sep 28, 2018 12:23 am

### Re: Octet Expansion

Once the 8 valence electrons from the s and p orbitals are filled up, they have to go to d orbitals where it could hold 10 more pairs of electrons. Then it would go to f and so on

304975260
Posts: 13
Joined: Mon Oct 08, 2018 12:15 am

### Re: Octet Expansion

The d orbital has a 10 electron capacity