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Lithium fluoride (LiF) has a density of 2.635 g/cm3 and the same crystal structure as NaCl....

Lithium fluoride (LiF) has a density of 2.635 g/cm3 and the same crystal structure as NaCl. Lithium has a mass of 6.941 amu and fluorine has a mass of 18.9984903 amu. amu means atomic mass unit, which is 1.66 *10-27 kg.

(a) What is the average spacing between adjacent atoms in a LiF crystal?

(b) Why is it a transparent crystal used in UV optics?

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