Expanded Valence Shells

Moderators: Chem_Mod, Chem_Admin

Amina Durrani 3G
Posts: 52
Joined: Sat Jul 20, 2019 12:16 am

Expanded Valence Shells

Postby Amina Durrani 3G » Sat Nov 02, 2019 5:11 pm

How exactly do expanded valence shells work, since the octet rule says that atoms share electrons until a noble gas configuration is reached?

AngieGarcia_4F
Posts: 120
Joined: Thu Jul 25, 2019 12:17 am

Re: Expanded Valence Shells

Postby AngieGarcia_4F » Sat Nov 02, 2019 5:48 pm

When atoms have d shells they can hold more than 8 electrons

Chris Tai 1B
Posts: 102
Joined: Sat Aug 24, 2019 12:16 am

Re: Expanded Valence Shells

Postby Chris Tai 1B » Sat Nov 02, 2019 6:01 pm

For instance, an atom like Phosphorus can hold more electrons than just the octet that it gets, since it would fill up its 3p shell, next moving onto the 3d and the 4s shells. Phosphorus can do this because it is in the 3rd period of the table. This is much more difficult for atoms that are in a lower period of the periodic table (period 1, or period 2 etc.)

Aarja Pavade 1H
Posts: 103
Joined: Sat Aug 17, 2019 12:18 am

Re: Expanded Valence Shells

Postby Aarja Pavade 1H » Sat Nov 02, 2019 6:36 pm

The octet guideline refers to 8 electrons. This gives us the configuration of s2p6. For atoms in Period 3 or higher, their n (principal quantum number) is 3. This gives us an l of 0,1,2, meaning that they have an s,p,and d orbital. The d-orbitals allow Period 3 and higher elements to accommodate the additional electrons.


Return to “Lewis Structures”

Who is online

Users browsing this forum: No registered users and 2 guests