Tin with only 6 electrons

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Douglas Nguyen 2J
Posts: 71
Joined: Fri Sep 28, 2018 12:15 am

Tin with only 6 electrons

Postby Douglas Nguyen 2J » Sat Nov 17, 2018 5:35 pm

"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?

Sean Reyes 1J
Posts: 67
Joined: Fri Sep 28, 2018 12:24 am

Re: Tin with only 6 electrons

Postby Sean Reyes 1J » Sat Nov 17, 2018 6:44 pm

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.

005113695
Posts: 59
Joined: Fri Sep 28, 2018 12:15 am

Re: Tin with only 6 electrons

Postby 005113695 » Sat Nov 17, 2018 10:10 pm

Since tin isn't in the first period, it can be an exception to the rule.

annabel 2A
Posts: 67
Joined: Fri Sep 28, 2018 12:18 am

Re: Tin with only 6 electrons

Postby annabel 2A » Mon Nov 26, 2018 9:58 pm

I thought that completing the octet was more important than minimizing formal charges?

Margaret Akey
Posts: 80
Joined: Fri Sep 28, 2018 12:18 am

Re: Tin with only 6 electrons

Postby Margaret Akey » Mon Nov 26, 2018 10:40 pm

not when you get lower down on the periodic table!


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