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    Which of these pieces of information would be the most use in helping a chemist decide on the likely chemical reactions of iron?
    The atomic number, the mass number or the electronic configuration?

    State one reason why the electronic configuration is usually more useful to chemists than the number of protons and neutrons, ie the mass number.
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    the electronic configuration

    the number of electrons in the outer shell determines what group it is in and what reactions it undergoes.
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    oh yes and what is the balanced equation for
    Na2O2 + H2O ?

    Thanks.
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    please help.
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    Na2O2(s) + 2H2O(l) ---> 2NaOH(aq) + H2O2(l)
 
 
 

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