Chemistry Lewis structure

Dec 2019
17
0
United States
Is this the correct explanation and Lewis structure for CH2O?6126332F-CEF0-4A6D-97B7-B87373F526A1.pngD1021E60-9624-4239-B174-FF6835378D03.jpeg
 
Sep 2018
70
17
England
Carbon is a bit of a special case.
Because it sits exactly midway between a full and an empty outer shell,
The shell stability is equally satisfied by either donating or accepting electrons into valence bonds.
It donates two electrons into the double bond with oxygen
and one to each of the bonds with the two hydrogen atoms.

Note that these are valence bonds, not ionic bonds,
so the valence electrons are "shared" between the bonded atoms
rather than being gained by one atom and lost from another.

Perhaps the Lewis diagram should be:
6126332F-CEF0-4A6D-97B7-B87373F526A1.png
So the full shell criteria is satisfied for the oxygen and the hydrogen, at the "expense" of the carbon.
 
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Dec 2019
17
0
United States
Carbon is a bit of a special case.
Because it sits exactly midway between a full and an empty outer shell,
The shell stability is equally satisfied by either donating or accepting electrons into valence bonds.
It donates two electrons into the double bond with oxygen
and one to each of the bonds with the two hydrogen atoms.

Note that these are valence bonds, not ionic bonds,
so the valence electrons are "shared" between the bonded atoms
rather than being gained by one atom and lost from another.

Perhaps the Lewis diagram should be:
View attachment 313
So the full shell criteria is satisfied for the oxygen and the hydrogen, at the "expense" of the carbon.
Is my explanation correct?
 
Dec 2019
17
0
United States
Carbon is a bit of a special case.
Because it sits exactly midway between a full and an empty outer shell,
The shell stability is equally satisfied by either donating or accepting electrons into valence bonds.
It donates two electrons into the double bond with oxygen
and one to each of the bonds with the two hydrogen atoms.

Note that these are valence bonds, not ionic bonds,
so the valence electrons are "shared" between the bonded atoms
rather than being gained by one atom and lost from another.

Perhaps the Lewis diagram should be:
View attachment 313
So the full shell criteria is satisfied for the oxygen and the hydrogen, at the "expense" of the carbon.
So carbon would have 6 electrons around it (not 8 as shown)
Should I change that?
 
Sep 2018
70
17
England
It was a loooong time ago that I did Lewis diagrams, and my memory of the subject is very rusty.
So I am reluctant to give a fully definitive response...

However (in my opinion) your description should have the carbon breaking the octet (full shell) rule,
but the oxygen and hydrogen holding to the rule, since they end up with full shells.

Note that this is somewhat different from the descriptions for ionic bonding.
 
Dec 2019
17
0
United States
For this, I keep seeing different structures..9B4DCFB1-BD0C-432E-AE53-1B36A0942AF5.jpeg392636C0-F27D-48A6-9F9D-C6514812B3C9.jpeg
 
Last edited:
Apr 2015
133
94
The double colon (or double doubledot) structure between the oxygen and carbon is correct.

But the colours and funny angles add nothing.
Just put the extra colon into Woody's picture.
 
Dec 2019
17
0
United States
The double colon (or double doubledot) structure between the oxygen and carbon is correct.

But the colours and funny angles add nothing.
Just put the extra colon into Woody's picture.
So the structure that I drew is correct?