## 2B.7

Posts: 55
Joined: Fri Sep 28, 2018 12:26 am

### 2B.7

How does the element E have 10 valence electrons?

Andrew Sun 1I
Posts: 30
Joined: Fri Sep 28, 2018 12:18 am

### Re: 2B.7

Some elements can have expanded octets, as explained in lecture on 10/29. Those elements that are in the third row can have expanded octets because the now have a d-orbital as well.

Fayez Kanj
Posts: 62
Joined: Fri Sep 28, 2018 12:18 am
Been upvoted: 1 time

### Re: 2B.7

The element is a period 3 element, meaning it could have a total of 18 valence electrons (2 from the s orbital, 6 from the p orbitals and 10 from the d orbitals). To solve this problem, you would subtract the total number of valence electrons that the molecule has, by the valence electrons of all the chlorines and oxygens, and the remaining valence electrons will tell you which group within period 3 the element "E" belongs to.

Hope this helps :)

Nina Do 4L
Posts: 61
Joined: Fri Sep 28, 2018 12:27 am

### Re: 2B.7

Since in D orbitals l=2, that means that l can be 1 and 2 so it breaks the octet rule