Octet Expansion


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

Octet Expansion

Postby Deepika Pugalenthi 1A » Sun Nov 25, 2018 10:47 am

Why is the d-orbital required for octet expansion?

Venya Vaddi 1L
Posts: 96
Joined: Fri Sep 28, 2018 12:16 am
Been upvoted: 2 times

Re: Octet Expansion

Postby Venya Vaddi 1L » Sun Nov 25, 2018 11:03 am

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

Postby Mark 1D » Sun Nov 25, 2018 8:06 pm

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

Postby 705192887 » Sun Nov 25, 2018 8:25 pm

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

Postby leediane0916 » Sun Nov 25, 2018 9:03 pm

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

Postby Daniel Chang 3I » Sun Nov 25, 2018 9:10 pm

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

Postby 304975260 » Sun Nov 25, 2018 10:27 pm

The d orbital has a 10 electron capacity


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