Chemical Formula by expected charges

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Jocelyn Thorp 1A
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am

Chemical Formula by expected charges

Postby Jocelyn Thorp 1A » Thu Oct 31, 2019 6:36 pm

for 2A.23, it asks to give the chemical formula based on the charges of the elements involved in the compounds. How do you know what the charge is in order to calculate this? In the problem, it asks to give the formula for magnesium arsenide, so if that can be used as an example, it'd be helpful.

Megan Ngai- 3B
Posts: 50
Joined: Fri Aug 09, 2019 12:17 am

Re: Chemical Formula by expected charges

Postby Megan Ngai- 3B » Thu Oct 31, 2019 6:47 pm

If you look up periodic table charges on Google images, it shows the charges per group (it's easy to remember). So Mg has a charge of +2 and As has a charge of -3. Therefore it would be Mg3As2.
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Jocelyn Thorp 1A
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am

Re: Chemical Formula by expected charges

Postby Jocelyn Thorp 1A » Thu Oct 31, 2019 7:03 pm

Megan Ngai- 3B wrote:If you look up periodic table charges on Google images, it shows the charges per group (it's easy to remember). So Mg has a charge of +2 and As has a charge of -3. Therefore it would be Mg3As2.


Oh, this is super useful! Do you know where the formal charge comes from?


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