The RbBr crystal structure consists of alternating Rb$^+$ and Br$^-$ ions lying next to each other in three dimensions. If the Rb$^+$ radius is 77.6\% of the Br$^-$ radius and the distance between Rb$^+$ nuclei is 696 pm, what are the radii of the two ions? Be sure each of your answer entries has the correct number of significant figures.
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