Question about what makes something ionic

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John_Richey_4A
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Joined: Fri Sep 28, 2018 12:27 am

Question about what makes something ionic

Postby John_Richey_4A » Fri Nov 16, 2018 6:29 pm

When I see HBr I anticipate its going to be ionic because its a large elctronegativity difference. Why am I wrong?

ian_haliburton_1f
Posts: 61
Joined: Fri Sep 28, 2018 12:24 am

Re: Question about what makes something ionic

Postby ian_haliburton_1f » Fri Nov 16, 2018 6:37 pm

Numerically speaking, have you checked to see if the difference is greater than 2? Otherwise there’s a good deal of room for ambiguity that can only be resolved experimentally.

Jonathan Omens 1K
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Joined: Fri Sep 28, 2018 12:15 am

Re: Question about what makes something ionic

Postby Jonathan Omens 1K » Sun Nov 18, 2018 10:36 pm

Because the difference in their electronegativities is only about .76, the bond has mostly covalent character. Only bonds with a difference in electronegativity of 2 or greater are said to have mostly ionic character.

305008749
Posts: 31
Joined: Fri Sep 28, 2018 12:27 am

Re: Question about what makes something ionic

Postby 305008749 » Sun Nov 18, 2018 10:39 pm

The electronegativity difference between H and Br atoms is not that large and the atoms in the molecules are not dependent on associated charges to stabilize one another.

Chris Dis3L
Posts: 45
Joined: Fri Sep 28, 2018 12:25 am

Re: Question about what makes something ionic

Postby Chris Dis3L » Sun Nov 18, 2018 11:54 pm

Ionic bonds form when the electro negativity difference between the bonding elements is roughly 1.8 or higher. Less than a 1.8 difference results in the creation of either a non-polar or a polar covalent bond. Thus, HBr does not form an ionic bond as their electronegativity difference is not greater than 1.8.

danicatran4
Posts: 35
Joined: Fri Sep 28, 2018 12:17 am

Re: Question about what makes something ionic

Postby danicatran4 » Sun Nov 18, 2018 11:56 pm

Are we going to be given an electronegative chart on the test?


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