The pyknometric density of sodium chloride crystal is 2.165 ×103 kg m–3 while its X–ray density is 2.178 × 103 kg m–3. The fraction of the unoccupied sites in sodium chloride crystal is
5.96
5.96 × 10–2
5.96 × 10–1
5.96 × 10–3
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Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell of lithium is 351 pm, the atomic radius of the lithium will be: