1.

In a compound, nitrogen atoms (N) make cubic close-packed lattice and metal atoms (M) occupy one-third of the tetrahedral voids present. Determine the formula of the compound formed by M and N?

Answer»

SOLUTION :Number of N atoms per unit CELL = 4
`therefore` Number of tetrahedral VOIDS `= 2 xx 4 = 8`
`therefore`Tetrahedral voids occupied by `M = 1/3 (8)`
The ratio of M-atoms to N-atoms.
` M:N = 8/3 :4=2/3:1 `
`therefore`Formula of COMPOUND = `M_2N_3`.


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