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_______.
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The atom which occupies the empty space formed in a closed packed structure is called ___________.
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True Or False
A.
The number of octahedral sites per sphere in fcc is 4.
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Fill In the Blanks
__________ is the most unsymmetrical primitive unit cell.
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Electron trapped in anion vacancies are known as__________.
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Of the three cubic lattices, the one that has the largest amount of empty space is the ____________.
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The point defect which lowers the density of the solid is called ______ defect.
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True Or False
A.
Cubic crystal system has one primitive unit cell and two centred unit cells.
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Fill In the Blanks
In a crystal lattice, the number of nearest neighbours to each atom is called the________.
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In the sodium chloride structure, each Na+ ion is surrounded by six CI– ions nearest neighbours and _____ Na+ ions next nearest neighbours.
