How to find number of electrons in an ion And how to find the charge of an ion?

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  • 4 weeks ago

    Can you give an example of the kind of question you are trying to figure out? 

    The basic idea is that a neutral atom has the same number of electrons as it does protons (its atomic number). If an ion has a +1 charge, that means it has lost 1 electron, and so has 1 fewer electrons that protons. If the ion has a -2 charge, then it has gained 2 electrons and so has 2 more electrons than protons.For many elements (those in the first two columns and the columns just before the noble gases), their position (which column) pretty  much tells you the charge of the ion. Li and below have +1 charged ions. Be and below are +2. F and below are -1, O and S are often -2, N and P can be -3. For other ions, you can usually figure out their charge if they are in compounds by using the charge of the other ion. So, in CaBr2, Ca forms a +2 ion, so each Br must have a -1 charge because all the charges have to equal 0. 

    Hope that helps some...

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