Cesium chloride crystallizes in cubic unit cell with Cl ⊖ ions at the corners and a Cs ⊕ ion in the centre of the cube. How many CsCl molecules are there in the unit cell?

A BCC unit cell has atoms at each corner of the cube and an atom at the centre of the structure. According to this structure, the atom at the body centre wholly belongs to the unit cell in which it is present. In BCC unit cell every corner has atoms. There is one atom present at the centre of the structure. BCC describes the structure of CsCl . So, a cubic cell has the following number of atoms, 8 × 1 8 + 1 = 2 . In the CsCl crystal, each unit cell has 2 atoms.

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Chemistry Standard 12>Chapter 1 - Solid State>Exercises>Q 3

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Calculate the number of atoms in fcc unit cell.

Important Questions on Solid State

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Chemistry Standard 12>Chapter 1 - Solid State>Exercises>Q 3

How are the spheres arranged in first layer of simple cubic close-packed structures? How are the successive layers of spheres placed above this layer?