## expanded octet

Sophia Dinh 1D
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

### expanded octet

When can you assume the octet can expand?

Kallista McCarty 1C
Posts: 212
Joined: Wed Sep 18, 2019 12:18 am

### Re: expanded octet

The octet can expand past the second row

Daniel Toscano 1L
Posts: 95
Joined: Tue Nov 13, 2018 12:18 am

### Re: expanded octet

If the element is in the 3rd row or under in the periodic table, then it can have an expanded octet as the third row has access to the d-block, which can hold ten more electrons if needed.

Ashley Kim 3F
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

### Re: expanded octet

Elements with orbitals in the d-block can have expanded octets. However, although P, S, and Cl do not have orbitals in the d-block, they are exceptions to the octet rule and can also hold more electrons than the standard octet.

Caitlin Ciardelli 3E
Posts: 44
Joined: Wed Sep 18, 2019 12:19 am

### Re: expanded octet

The elements that are in row three and below can have expanded octets. This is due to the fact that the elements row three and below can utilize the d orbital, allowing an additional ten electrons after the initial octet. Row 2 and above however, is limited to an octet, eight electrons, because they can only utilize s and p orbitals.

Diana A 2L
Posts: 106
Joined: Sat Aug 17, 2019 12:16 am
Been upvoted: 1 time

### Re: expanded octet

Why do P, S, and Cl have expanded octets if they don't have d-orbitals? It doesn't make much sense.

AronCainBayot2K
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

### Re: expanded octet

Elements that can have expanded octets include the 3rd row and every element below. This is due to the d-block with some elements as an exception to this rule. Elements above the third row must fulfill the octet rule when drawing a lewis structure.

Kaitlynn Tran 3F
Posts: 54
Joined: Wed Sep 18, 2019 12:20 am

### Re: expanded octet

Most atoms after P on the periodic table in the d-block can have an expanded octet.