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Jina Kwon
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Postby Jina Kwon » Thu Oct 31, 2019 4:54 pm

What happens when A and B have a bond, but one is more electronegative in comparison to the other?

LNgo 1G
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Re: electronegative

Postby LNgo 1G » Thu Oct 31, 2019 5:02 pm

The more electronegative atom pulls the electrons closer to it, resulting in a partial negative charge on that atom and a partial positive charge on the other.

Ryan Narisma 4G
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Re: electronegative

Postby Ryan Narisma 4G » Thu Oct 31, 2019 5:22 pm

Hi Jina Kwon! I am confused as to which type of bond you are talking about, but I will assume it's a covalent bond. If two elements are bonded covalently and one is more electronegative than the other, then the element that is more electronegative will be pulling the shared electrons to that element more. Recall that electronegativity is the element's electron pulling power. Because one of the elements is more electronegative, that element will pull the shared pair of electrons. This creates an uneven sharing of electrons where most of the electrons will be pulled toward the more electronegative atom. Because electrons will spend a majority of the time near or at the more electronegative atom, the electronegative atom will have a partial negative charge and the less electronegative atom will have a partial positive charge.

Consider a dog and its owner as an example. When you are playing fetch and try to take the toy away from your dog's mouth, you tug on the toy but your dog tugs back. You are going to pull harder and therefore the toy will be on your "side" for a majority of the time (until your dog decides to let go). However, you are still "sharing" the toy since you both are trying to pull it away.

Because the electronegative atom will be pulling the shared pair of electrons more strongly, the electrons are spending most of their time in the vicinity of that atom; therefore, the more electronegative atom will have a bit of a negative charge but not a full negative charge because the electrons are still shared between the two species.

Victor James 4I
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Re: electronegative

Postby Victor James 4I » Fri Nov 01, 2019 2:01 am

the difference in electronegativity will determine whether or not the bond is ionic or covalent

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Re: electronegative

Postby 005206171 » Fri Nov 01, 2019 2:07 am

It depends. If the difference is really big, the atom w the higher electronegativity will literally "pull" electron(s) from the other atom. The result is a cation and anion, and an ionic bond forms because of electrostatic forces between opposite charges (another way of saying opposites attract). If they're relative/similar but still a significant difference, the two atoms will share electrons but the atom w/ the higher electronegativity will pull these shared electrons towards its nucleus, creating a partial positive charge for that atom. The other atom(s) will have a partial negative charge. a good example is a water. This is also known as a dipole moment, characteristic of polar covalent bonds. The cutoff will depend, it just varies. But I don't think you will have to know the values exactly. But it will be helpful to be able to explain how differences in electronegativity will affect how atoms bond.

andrewcj 2C
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Re: electronegative

Postby andrewcj 2C » Fri Nov 01, 2019 2:58 am

If one atom is more electronegative than the other, the electrons will spend more time on average around that atom, and the character of the bond would become more ionic.

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Re: electronegative

Postby ranqiao1e » Fri Nov 01, 2019 11:21 am

Then the bond is said to be polar. Since the more electronegative atom hogs more electrons to its side, it has a partial negative charge, while the other atom has a partially positive charge.

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