## Ammonium Sulfate Example in Notes

Bree Perkins 1E
Posts: 34
Joined: Fri Apr 06, 2018 11:04 am

### Ammonium Sulfate Example in Notes

Hi,

I am having trouble understanding how the professor figured out how many electrons are in $(NH_{4})_{2}SO_{4}$. It says that there are 5 electrons in N and 6 electrons in O. How do you know how many are in the valence shell? I thought for N it would have 3 valence e- because it is third in the p-block, and O would have 4. If someone could help me out with this concept I would really appreciate it!

LilianKhosravi_1H
Posts: 32
Joined: Fri Apr 06, 2018 11:03 am

### Re: Ammonium Sulfate Example in Notes

To figure out the valence electrons of an elements just count across the periodic tables from the left to the right starting with one and ending with eight. So all the elements in group 1 have one valence electron like H, Li, and Na. N has 5 valence electrons because when you start counting from Li, you get to 5 by the time you reach N so that's the number of the valence electrons. Same thing with O, it has 6 since it's right after N which has 5.

Mario Reyes 1C
Posts: 45
Joined: Fri Apr 06, 2018 11:04 am

### Re: Ammonium Sulfate Example in Notes

Be sure to skip the transition metals when trying to count the number of valence electrons from left to right.