my teacher wrote NH3 lewis structure ...3 single bonds and a lone pair...yet it sums up to 4 sigma bonds...that means a ,one pair counts as a sigma bond right?
thank you so much :)
thank you so much :)
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Every bond is made up of at least one sigma bond. Each multiple bond had a sigma bond and then one or two pi bonds, for example:
C-C = 1 sigma bond
C=C = 1 sigma, 1 pi bond
C (triple bond) C = 1 sigma, 2 pi bonds
This is true for all single, double, and triple bonds, regardless of the atoms involved.
A lone pair of electrons is not a part of a bond, so to answer your question, no it does not count as a sigma bond. What you may have misread or your teacher may have meant to teach was that in ammonia, all of the three bonds and the lone pair are associated with sp3 orbitals. Again, each of the three sigma (single) bonds to hydrogen are apart of an sp3 molecular orbital, and the lone pair on the nitrogen is also held in an sp3 molecular orbital.
That's the only possible quality I can think of that the bonds and the lone pair electrons share, you should ask your teacher to find out!
C-C = 1 sigma bond
C=C = 1 sigma, 1 pi bond
C (triple bond) C = 1 sigma, 2 pi bonds
This is true for all single, double, and triple bonds, regardless of the atoms involved.
A lone pair of electrons is not a part of a bond, so to answer your question, no it does not count as a sigma bond. What you may have misread or your teacher may have meant to teach was that in ammonia, all of the three bonds and the lone pair are associated with sp3 orbitals. Again, each of the three sigma (single) bonds to hydrogen are apart of an sp3 molecular orbital, and the lone pair on the nitrogen is also held in an sp3 molecular orbital.
That's the only possible quality I can think of that the bonds and the lone pair electrons share, you should ask your teacher to find out!
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Check that again it should only have 3 sigma bonds.The creation of bonds between atoms that are not connected in a ring requires the same number of atoms minus one (such as in hydrogen gas, H2, where there is only one sigma bond, or ammonia, NH3, where there are only 3 sigma bonds), and that rings do not obey this rule (such as benzene rings, which have 6 sigma bonds within the ring for 6 carbon atoms).
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A sigma bond is well, a way of 2 atoms bonding. A lone pair, by definition, isn't bonded, so no, it's certainly doesn't count as a sigma bond.
Where did you see that NH3 has 4 sigma bonds? It only has 3, one per each hydrogen-nitrogen bond.
Edit: To Sean: Now that you mention that, it occurred to me that maybe the teacher meant regions of high electron density. In that case, it'd have 4.
Where did you see that NH3 has 4 sigma bonds? It only has 3, one per each hydrogen-nitrogen bond.
Edit: To Sean: Now that you mention that, it occurred to me that maybe the teacher meant regions of high electron density. In that case, it'd have 4.
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choose a best answer mate :)
and to L almnd, i was wondering how does this have 4 regions of high electron density?
is it by, one is "s" orbital and the three "p" orbitals?
and to L almnd, i was wondering how does this have 4 regions of high electron density?
is it by, one is "s" orbital and the three "p" orbitals?
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Every BOND is a sigma bond. Lone pairs are not a bond. Extra bonds are called pi bonds.
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hardon
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I'm pretty sure that it does count.