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x's atomic no.=3 mass no.=7 & Y's atomic no.=8 mass no.=16 then what will be the formula of the compound formed by atom's X & Y? also show its derivation.

Lithium oxide (Li2O) or lithia is an inorganic chemical compound. Lithium oxide is formed along with small amounts of lithium peroxide when lithium metal is burned in the air and combines with oxygen:[2]
4Li + O2 -------> 2Li2O.
Pure Li2O can be produced by the thermal decomposition of lithium peroxide, Li2O2, at 450 °C.
2Li2O2 â?? 2Li2O + O2.


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