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Postby alexagreco1A » Fri May 18, 2018 11:58 am

On the basis of expected charges on the monatomic ions, give the chemical formula of each of the following compounds;
I am a bit confused about the elements in group 13 when it comes to determining their charges. Is there a pattern or a rule to follow here?

Sam Metzger 1C
Posts: 25
Joined: Wed Apr 04, 2018 3:00 am

Re: 3.25

Postby Sam Metzger 1C » Fri May 18, 2018 12:08 pm

As a general rule, group 13 elements have a charge of 3+. But it may be more useful to think about their bonding in the sense that they often make three bonds, such as BF3, which bonds with another atom or molecule to form a larger compound.

Emily 1E
Posts: 27
Joined: Fri Apr 06, 2018 11:03 am

Re: 3.25

Postby Emily 1E » Sun May 20, 2018 11:06 am

Although in general they have 3+ charges, it also depends on which atom(s) they are bonding with. If an element, like Bi, is bound to a more electronegative element it will have a 3+ positive charge. However, if Bi was the more electronegative atom in a molecule it would likely gain electrons to become negatively charged, and have, say, a 3- charge.

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