Expanded Octet Rule and Coordination Compounds

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Nisarg Shah 1C
Posts: 54
Joined: Sat Jul 22, 2017 3:00 am

Expanded Octet Rule and Coordination Compounds

Postby Nisarg Shah 1C » Sat Nov 18, 2017 1:25 pm

I do not understand how nickel can be a central atom of a coordination compound and form 10 coordinate covalent bonds with other ligands. I thought Nickel is only allowed to have 18 valence electrons with an expanded octet (2 electrons from s, 6 from p, and 10 from d). Do the central atoms in coordination compounds not follow the octet/expanded octet rule? And if they don't, why is this possible?

Tanaisha Italia 1B
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

Re: Expanded Octet Rule and Coordination Compounds

Postby Tanaisha Italia 1B » Sat Nov 18, 2017 9:49 pm

I think that because Nickel has two electrons from the 4s subshell and 8 electrons from 3d, it can form 10 bonds in a coordination compound. It is similar to how Sulphur can form 6 bonds (2 electrons in 3s + 4 electrons in 3p) due to the expanded octet rule and its empty d-orbitals.


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