A solid has a structure in which ‘X’ atoms are located at the corners of a cubic lattice, ‘Y’ atoms at the alternate faces of the cube, then the simple formula of the unit cell is_______.

XY3
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The point defect which lowers the density of the solid is called ______ defect.


Schottky 
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Electron trapped in anion vacancies are known as__________.

F-centre

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__________ is the most unsymmetrical primitive unit cell.

Triclinic
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The atom which occupies the empty space formed in a closed packed structure is called ___________.

interstitial atoms
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