## Expanded octets

Enzo_1I
Posts: 19
Joined: Fri Apr 06, 2018 11:02 am

### Expanded octets

What makes the elements in the 3rd row and below able to have an expanded octet? And what determines how many electrons an atom can hold if it has an expanded octet?

Liliana Rosales 1E
Posts: 36
Joined: Wed Nov 15, 2017 3:03 am

### Re: Expanded octets

Because elements in the 3rd row and below are part of the d orbital, they are able to have an expanded octet. If the element is found in the third row, then it can have up to 10 extra electrons because the d orbital can hold ten electrons.

RubyLake1F
Posts: 41
Joined: Fri Apr 06, 2018 11:03 am

### Re: Expanded octets

Elements in the third row and below have an expanded octet because they have a 'd' sub-shell which can fit an extra 10 electrons (third row means that n=3, so 'l' can equal 0, 1, or 2 meaning that this row of the table has s, p, and d sub shells).
The number of extra electrons an element can hold in its expanded octet is equal to the number of electrons it can hold in the extra sub shell (5 d sub shells=10 electrons). For an element in rows even further down I think that the f sub shell could hold even more electrons, but I don't think we need to know this far down the table.