14.1 chromium

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Emily Glaser 1F
Posts: 156
Joined: Thu Jul 27, 2017 3:01 am

14.1 chromium

Postby Emily Glaser 1F » Mon Feb 19, 2018 3:21 pm

How am I supposed to know that in Cr2O7 2-, Cr has a +6 charge? How would I go about figuring it out?

Lisa Tang 1C
Posts: 62
Joined: Fri Sep 29, 2017 7:05 am
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Re: 14.1 chromium

Postby Lisa Tang 1C » Mon Feb 19, 2018 3:36 pm

Each O is usually 2-, and there are 7 of them. 7 x 2- = 14-. The overall charge of the molecule is 2-. The difference between the overall charge and the oxygens is 12+. Each Cr is therefore 6+.


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