What is the emperical formula for Hg2(NO3)2?

What is the emperical formula for Hg2(NO3)2?
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HgNO3 The empirical formula of an ionic compound represents the lowest whole-number ratio of each ion. Note: Hg2(NO3)2 is Mercury (I) nitrate. There is a mercury (II) nitrate compound with the formula Hg(NO3)2.
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