in a unit cell, atoms A,B,C,D are present at half of total corners, all face-centres, body centre and one third of all edge-centres respectively. then formula of unit cell is??
1)AB3CD3  2)ABCD  3)AB6C2D2    4)AB6C2D4

Atoms at the corner in a unit cell is 1
No of atoms of A in one unit cell = ½

Atoms at the corner in a unit cell is 3
No of atoms of B in one unit cell = 3

Atoms at the body center in a unit cell is 1
No of atoms of C in one unit cell = 1

Atoms at the edge center in a unit cell is 3
No of atoms of D in one unit cell = 1

Formula is A1/2B3CD or AB6C2D2

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