## expanded octet?

Giovanni Anguiano-Gutierrez 3L
Posts: 52
Joined: Thu Jul 25, 2019 12:17 am

### expanded octet?

Why do S, Cl, and P have expanded octets?

Jacob Motawakel
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am
Been upvoted: 1 time

### Re: expanded octet?

Their valence shells have enough orbitals to accommodate extra electrons.

Posts: 53
Joined: Wed Sep 11, 2019 12:17 am

### Re: expanded octet?

Accommodating more electrons often works for the d-orbital. An element with a principle quantum number of 2 cannot be expanded because there is no 2d-orbital.

Jordan Ziegler 2J
Posts: 59
Joined: Sat Aug 17, 2019 12:15 am

### Re: expanded octet?

Looking at the periodic table, elements with unfilled d-orbitals will be able to sustain expanded octets. Because phosphorus, sulfur, and chlorine are in Period 3, they don't have filled d-orbitals. Thus, they will accept bonding pairs.

Posts: 113
Joined: Thu Jul 11, 2019 12:16 am

### Re: expanded octet?

Also, an important conceptual point to add: the possibility of an expanded octet continues for the atoms below Cl, P, and S within the p-block.

Sam McNeill 1E
Posts: 110
Joined: Sat Aug 24, 2019 12:17 am

### Re: expanded octet?

All p-block elements Period 3 and down can be expanded because they have the option to move electrons to the d-block.

Kelsey Ash 1D
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Joined: Wed Sep 18, 2019 12:16 am

### Re: expanded octet?

Elements that haven't filled their d-orbital can have an expanded octet.

Sion Hwang 4D
Posts: 51
Joined: Wed Sep 18, 2019 12:21 am

### Re: expanded octet?

They're in period 3, which means that they have access to the 3d orbital. This orbital can accommodate extra orbitals, so these atoms can have over 8 valence electrons.

Leila_4G
Posts: 114
Joined: Sat Sep 14, 2019 12:17 am

### Re: expanded octet?

Were there any other elements perhaps in the same group way down the periodic table that have this exception other than those 3?

Arvind 4G
Posts: 51
Joined: Thu Jul 11, 2019 12:17 am
Been upvoted: 1 time

### Re: expanded octet?

They do not have a filled d orbital and are thus able to have expanded octets.