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Chemistry
Chemistry
Problem
A crystal of sodium hydride has fcc unit cell of
H
−
\text{H}^-
H
−
ions with
Na
+
\text{Na}^+
Na
+
ions at the body centres of unit cell and in the centre of edges. The no. of
H
−
\text{H}^-
H
−
that touch each
Na
+
\text{Na}^+
Na
+
is .....
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