JEE Main Chemistry question
Not in JEE Main or NEET syllabus
A crystal of sodium hydride has an fcc unit cell of ions with ions at the body centre of the unit cell and at the centre of the edges. The number of ions that touch each is .
Answer: 6
Solution
The positions described (body centre + all edge centres) are exactly the octahedral voids of the fcc lattice — i.e. has the rock-salt
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