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It depends which atom you are drawing!

In the centre, you have a nucleus...always.

Then 2 electrons ALWAYS.

Then, for example OXYGEN, has 6 on the outer shell.

Please, search this on bitesize OR the general internet. This is correct, but I dont think you will understand it, just by me saying that ^

Hope this has helped you understand that an atom always has a nucleus in the middle, and has 2 electrons on this inner circle... PLEASE SEARCH THIS ON THE INTERNET!

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