In a highly ionic crystal of at standard room temperature, the approximate number of Schottky defect pairs (missing cation-anion pairs) present per cubic centimeter () of the crystal is of the order .

Question

In a highly ionic crystal of $NaCl$ at standard room temperature, the approximate number of Schottky defect pairs (missing cation-anion pairs) present per cubic centimeter ($cm^3$) of the crystal is of the order $10^x$. What is the integer value of $x$?

Prashant Kotian · Accepted Answer

Correct answer: 6. According to standard crystallographic measurements for highly ionic solids like , there are approximately Schottky pairs per at standard room temperature. While small relative to the total number of ions (), these macroscopic defects are enough to initiate measurable ionic conductivity.

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