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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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tony365 tony365
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11 years ago
A question in my chemistry homework says:

Give the charge (ex. 2+, 3-) of a polyatomic ion that has one fewer electron than the sum of its valence electrons.

Give the charge of a polyatomic ion that has two more electrons that the sum of its valence electrons.


I don't even know where to begin. The questions just confuse me. Can anyone please help?
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wrote...
#1
11 years ago
(NH4)+ and (SO4)2- are examples.
wrote...
#2
11 years ago
(NH4)+ and (SO4)2-

If it has one fewer charge than the sum of its valence electrons then (NH4)+ becomes (NH4) and (SO4)2- becomes (SO4)3-
Im Sure...
And If it has two more electrons that the sum of its valence electrons then (NH4)+ becomes (NH4)- and (SO4)2- becomes (SO4)4-
wrote...
#3
11 years ago Edited: 11 years ago, bio_man
The reason is NH4 would have 5 + 4 valence electrons and would be neutral, but if we remove (one fewer electron than the sum of its valence electrons) one electron we are left with a +     For SO4, we would have 6 + 24 valence electrons and no charge, but if we add (two more electrons that the sum of its valence electrons) two electrons, we get a 2- charge.
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