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Question

The formula of radium bromide is RaBr2. What is the formula of Radium phosphate?


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Solution

It is given that the formula of Radium bromide is RaBr2

By applying the criss-cross method we can find the valency of Radium.

SymbolsRaBrValency21

Thus, the valency of Radium is found to be 2

Now, the molecular formula of Radium phosphate can be determined by the criss-cross method.

SymbolRaPO4Valency23

Hence, the molecular formula of Radium phosphate is Ra3(PO4)2


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