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Tin with only 6 electrons

Posted: Sat Nov 17, 2018 5:35 pm
by Douglas Nguyen 2J
"4.19 Predict the shapes and estimate the bond angles of...(d) SnCl2."

In the Lewis dot structure for SnCl2, tin is drawn to only have 6 electrons. Why is it that tin is an exception to the octet rule?

Re: Tin with only 6 electrons

Posted: Sat Nov 17, 2018 6:44 pm
by Sean Reyes 1J
Using the formal charge equation and with tine having two single bonds and one lone pair, tin would be:
FC = 4 - (2 + (4/2)) = 4 - (2 + 2) = 0.
This means that there is a formal charge of 0, which represents a pretty stable compound.

Re: Tin with only 6 electrons

Posted: Sat Nov 17, 2018 10:10 pm
by 005113695
Since tin isn't in the first period, it can be an exception to the rule.

Re: Tin with only 6 electrons

Posted: Mon Nov 26, 2018 9:58 pm
by annabel 2A
I thought that completing the octet was more important than minimizing formal charges?

Re: Tin with only 6 electrons

Posted: Mon Nov 26, 2018 10:40 pm
by Margaret Akey
not when you get lower down on the periodic table!