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Question
The coordination number in 3-D BCC close packing structure is
The coordination number in 3-D BCC close packing structure is
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Solution
The correct option is C 8
In 3D BCC closed packing, the spheres in the first layer are square (but not close) packed, in slightly opened up manner. These sphere of the first layers are not touching each other.
The spheres in second layer are not touching with each other, placed at the top of the hollow spaces in the first layer.
The spheres in the third layer are placed exactly as in the first layer.
Thus, it forms a body centred cubic unit cell where the central atom is attached to eight atoms present in the corners of the unit cell and each atom at corner is surrounded by 8 other atoms at body centre of unit cells. Thus, the coordination number of BCC close packing is 8.
In 3D BCC closed packing, the spheres in the first layer are square (but not close) packed, in slightly opened up manner. These sphere of the first layers are not touching each other.
The spheres in second layer are not touching with each other, placed at the top of the hollow spaces in the first layer.
The spheres in the third layer are placed exactly as in the first layer.
Thus, it forms a body centred cubic unit cell where the central atom is attached to eight atoms present in the corners of the unit cell and each atom at corner is surrounded by 8 other atoms at body centre of unit cells. Thus, the coordination number of BCC close packing is 8.
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