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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: appleseed on February 28, 2009, 08:36:52 AM

Title: If you know the number of electrons there are on an atom can you find its formul
Post by: appleseed 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!
Title: Re: If you know the number of electrons there are on an atom can you find its formul
Post by: sm2345 on February 28, 2009, 09:00:54 AM
It generally works for ionic compounds.
Title: Re: If you know the number of electrons there are on an atom can you find its formul
Post by: appleseed on February 28, 2009, 09:14:09 AM
hmm, the question says that its covalent
so what should i do?
Title: Re: If you know the number of electrons there are on an atom can you find its formul
Post by: sm2345 on February 28, 2009, 12:52:53 PM
Could you please clarify what the question is?
Title: Re: If you know the number of electrons there are on an atom can you find its formul
Post by: appleseed 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
Title: Re: If you know the number of electrons there are on an atom can you find its formul
Post by: abhaymv 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..
Title: Re: If you know the number of electrons there are on an atom can you find its formul
Post by: pingvincina 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