Complicated Lewis Structures

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juliasloan_4g
Posts: 67
Joined: Fri Sep 28, 2018 12:28 am

Complicated Lewis Structures

Postby juliasloan_4g » Tue Nov 27, 2018 3:28 pm

I'm having a hard time knowing where to put each element with more complicated Lewis structures. For example, in question 2E19. in the seventh edition it asks for the shape and bond angles of (CH3)2Be. I drew the Lewis structure and it seemed correct. I drew it as H-C-C-Be with two more hydrogens on each Carbon. However, when I looked at the solutions manual it has it as H-C-Be-C-H. How do you know where to put each element when its not as simple as determining just one central atom?

kamalkolluri
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am
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Re: Complicated Lewis Structures

Postby kamalkolluri » Tue Nov 27, 2018 3:38 pm

A lot of the time it's written a certain way which helps you figure it out. So for example in that one, it's written (CH3)2Be. This means the CH3 group is together. and since Be forms two bonds you use intuition to know that its in the middle and connects to CH3 on each side.

Nicoline Breytenbach 3D
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Re: Complicated Lewis Structures

Postby Nicoline Breytenbach 3D » Tue Nov 27, 2018 3:48 pm

I struggle with this too, and I've found that double checking the formal charges helps me a lot.

SydBenedict2H
Posts: 60
Joined: Wed Nov 08, 2017 3:00 am

Re: Complicated Lewis Structures

Postby SydBenedict2H » Tue Nov 27, 2018 4:17 pm

Are you referring to the [] compound's we covered in class on Monday? The coordinated compounds/bonds?


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