What is the coordination number of \( \mathrm{Rb}^{+} \)in \( \mathrm{RbBr} \) unit cell if ioni...

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What is the coordination number of \( \mathrm{Rb}^{+} \)in \( \mathrm{RbBr} \) unit cell if ionic radii of \( \mathrm{Rb}^{+} \)and \( \mathrm{Br} \) ions being 148 and 195 respectively?
(1) 6
(2) 4
(3) 8
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