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    Just a quick question. Sometimes group 1 compounds are like so e.g. NaOH .

    But when the group 1 element reacts with certain elements I have seen their formulae like this e.g. Na2CO3.

    So my question is when is the group 1 element written with a 2 after it? In which compounds?

    Just a simple explanation and examples will do nothing thorough.

    Thanks
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    When the anion has a 2- charge then you need 2 +1 metal ions.

    So OH- only needs one Na+ to give no overall charge, whereas CO32- needs two.
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    (Original post by ThisIsOurDecision)
    When the anion has a 2- charge then you need 2 +1 metal ions.

    So OH- only needs one Na+ to give no overall charge, whereas CO32- needs two.
    Thanks that makes sense
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    You probs have the answer already;

    It depends on the charge of the ion on the species it wants to form a compound with.

    Like Na has a +1 ion and SO4 (sulphate) has a -2 charge ion; it gives Na2SO4. :]
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    i think the case has been solved here :holmes:
 
 
 
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