H 2 O (ice) is an example of

Hydrogen bonded molecular solid

Silver metal crystallises with a face centred cubic lattice. The length of the core of unit cell is found to be 4 . 077 × 10 - 8 cm . Calculate the atomic radius and density of silver.

The formula to calculate the atomic radius of face-centred cubic lattice is as follows: r = a 2 4 Where, r is the atomic radius and a is the length of the unit cell. r = 4 . 077 × 10 - 8 cm × 2 4 r = 1 . 441 × 10 − 8 cm So, the atomic radius of the face-centred cubic lattice is 1 . 441 × 10 − 8 cm . The formula to calculate the density of cubic lattice is as follows: d = zm N a a 3 Where, d is the density, z is the number of atoms in a unit cell and m is the molar mass of the metal. For fcc lattice, the number of atoms are four. The molar mass of silver is 108 g . d = 4 × 108 g / mol 6 . 02 × 10 23 mol - 1 × ( 4 . 077 × 10 − 8 cm ) 3 d = 432 g 40 . 796 cm 3 d = 10 . 589 g / cm 3 So, the density of silver is 10 . 589 g / cm 3 .

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In a orthorhombic crystal system axis angles, $α = β = γ$ are

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