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### Topic: If you know the number of electrons there are on an atom can you find its formul  (Read 3572 times)

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#### 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!

#### 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.

#### 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?

#### 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?

#### 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

#### 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