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181. Of the three cubic lattices, the one that has the largest amount of empty space is the ____________.

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182. In a crystal lattice, the number of nearest neighbours to each atom is called the________.

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183. In the sodium chloride structure, each Na⁺ion is surrounded by six CI^– ions nearest neighbours and _____ Na⁺ ions next nearest neighbours.

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

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185. Electron trapped in anion vacancies are known as__________.

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

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187. __________ is the most unsymmetrical primitive unit cell.

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XY₃

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189.

Cubic crystal system has one primitive unit cell and two centred unit cells.

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190.

The number of octahedral sites per sphere in fcc is 4.

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