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Hi everyone.
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So write the chemical formula of each compound.
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So let us understand the concept.
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So nitride ion is n3 negative, phosphide ion is p3 negative, sulfide ion is s2 negative and oxide ion is o2 negative.
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So now let us see.
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So first compound is stoncium nitride.
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So symbol stonium and nitride for nitrogen we can use here.
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So valenci of stronium that is 2 and nitrogen that is 3.
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So you just criss -cross to make the formula of the compound.
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So the formula of the stonium nitride that is sr 3 and 2.
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So same approach we can use in other compounds.
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So here we are lithium phosphide.
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So symbol is lithium phosphorus and valency...