Ions


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victoria1l
Posts: 29
Joined: Fri Apr 06, 2018 11:05 am

Ions

Postby victoria1l » Tue May 22, 2018 10:29 pm

When given a formula with a charge, how do we know which atom to apply the charge to?

Jocelyn Fermin1J
Posts: 49
Joined: Tue Nov 14, 2017 3:01 am

Re: Ions

Postby Jocelyn Fermin1J » Tue May 22, 2018 11:43 pm

victoria1l wrote:When given a formula with a charge, how do we know which atom to apply the charge to?


Hi Victoria!
Is this what you mean,
if there was a charge on a molecule such as a tetrahydroborate ion- BH4^- or otherwise known as [BH4]^-
you give the charge to the whole molecule so:
Boron has= 3 electrons
Hydrogen has=1(4) electrons
-----------------
7 electrons
+ 1 electron because of the - if there was a + then you would subtract
--------------------
8 electrons
thus, the structure would look like
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victoria1l
Posts: 29
Joined: Fri Apr 06, 2018 11:05 am

Re: Ions

Postby victoria1l » Wed May 23, 2018 8:38 pm

so would the extra electron go to Boron?

Tiffany Chen 1A
Posts: 36
Joined: Fri Apr 06, 2018 11:02 am
Been upvoted: 1 time

Re: Ions

Postby Tiffany Chen 1A » Wed May 23, 2018 10:30 pm

The extra electron isn't really designated to a specific atom. You just have to account for the extra electron when you're adding up all the valence electrons in the molecule and then draw the structure the same way you would draw any other structure. Also, just put brackets around the structure with the total charge on the outside corner to clearly note that the molecule has a charge.

victoria1l
Posts: 29
Joined: Fri Apr 06, 2018 11:05 am

Re: Ions

Postby victoria1l » Sun May 27, 2018 9:00 pm

Thanks for the clear up!


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