Na and Mg crystallise in BCC and FCC type of crystals respectively, then the number of atoms of Na and Mg present in the unit cell of their respective crystals is
A
4, 2
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B
9, 14
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C
14, 9
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D
2, 4
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Solution
The correct option is D 2, 4 In BCC, Z = 2, In FCC , Z = 4