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Topic: If you know the number of electrons there are on an atom can you find its formul  (Read 4155 times)

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Offline appleseed

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If you know the number of electrons there are on an atom can you find its formul
« on: February 28, 2009, 08:36:52 AM »
If you know the outer number of electrons there are on an atom can you find its formula?

If you have and atom X with 4 outer electrons
and Y with 5 outer electrons do you just swap the numbers round to find the formula of its compound?
so i end up with X5Y4?
Or is this the way to find an ionic formula?

ThankYOu!
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Offline sm2345

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Re: If you know the number of electrons there are on an atom can you find its formul
« Reply #1 on: February 28, 2009, 09:00:54 AM »
It generally works for ionic compounds.
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Offline appleseed

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Re: If you know the number of electrons there are on an atom can you find its formul
« Reply #2 on: February 28, 2009, 09:14:09 AM »
hmm, the question says that its covalent
so what should i do?
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Offline sm2345

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Re: If you know the number of electrons there are on an atom can you find its formul
« Reply #3 on: February 28, 2009, 12:52:53 PM »
Could you please clarify what the question is?
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Offline appleseed

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Re: If you know the number of electrons there are on an atom can you find its formul
« Reply #4 on: February 28, 2009, 11:39:24 PM »
ok the question is deduce the formula of a covalently bonded compound that contains X (with 4 outer electrons ) and Y with 6 outer electrons.
I was just wondering if there's a general formula or rule that can help me deduce the formula with any number of electrons
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Offline abhaymv

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Re: If you know the number of electrons there are on an atom can you find its formul
« Reply #5 on: March 01, 2009, 12:18:32 AM »
Swapping should work, and you should cancel out the common factors.
So,it is
X3Y2
This,Ithink, is the answer..
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Offline pingvincina

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Re: If you know the number of electrons there are on an atom can you find its formul
« Reply #6 on: March 01, 2009, 09:00:10 AM »
in my opinion it's easier to take examples...if it's a covalent bond, take for example carbon and oxygen,they will form CO2,so it's XY2...but if the bond is ionic than it's X6Y4=X3Y2
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