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One mole crystal of a metal halide of th...

One mole crystal of a metal halide of the type MX with molecular weight 119 g having face centered cubic structure with unit cell length `6.58 Å` was recrystallized. The density of the recrystallized crystal was founed to be `2.44 g cm^(-3)`. The type of defect introduced during the recrystallization is

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