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Aqueous solutions of radium-223-chloride are used to treat cancer in the bone. What is the charge on radium-223 in these solutions? A. -2 B.+1 C.

Aqueous solutions of radium-223-chloride are used to treat cancer in the bone. What is the charge on radium-223 in these solutions?

A. -2

B.+1

C. -1

D. +2

the correct answer is D but I don't understand why.

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