An isotope of Luckycharmium has a half-life of 120 days. How many days will have passed when 50% of a Luckycharmium sample remains?
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Ответ:
i think it's I
I was confused by IV then search on gg and it said ZnSO4 should be Zn2SO4 instead but still im not sure Zn2SO4 is real