\( \mathrm{NaH} \) crystallizes in the same structure as that \( \m...

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\( \mathrm{NaH} \) crystallizes in the same structure as that \( \mathrm{NaCl} \). The edge length of the cubic unit cell of \( \mathrm{NaH} \) is \( 4.88 \AA \).
(a) Calculate the ionic radius of \( \mathrm{H}^{-} \), provided the ionic radius of \( \mathrm{Na}^{+} \)is \( 0.95 \AA \).
(b) Calculate the density of \( \mathrm{NaH} \).
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