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determine the oxidation number of

MgBR2(s)
and
NH4No3(s)

1 answer

You want the numbers for the molecule to add to zero. For example, Mg is in group II so it is +2. Br is -1(group VIIA or 17 depending upon the system you are using), there are two of them for a total if -2. +2 and -2 = 0
Here are a set of simple rules for helping determine the oxidation state of elements in compounds. Read those and do NH4NO3.
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