A compound of formula


A compound of formula $\mathrm{A}_{2} \mathrm{~B}_{3}$ has the hcp lattice. Which atom forms the hep lattice and what fraction of tetrahedral voids is occupied by the other atoms:

  1. hep lattice-A, $\frac{2}{3}$ Tetrachedral voids-B

  2. hep lattice-B, $\frac{1}{3}$ Tetrachedral voids-A

  3. hep lattice-B, $\frac{2}{3}$ Tetrachedral voids-A

  4. hep lattice-A $\frac{1}{3}$ Tetrachedral voids-B

Correct Option: , 2


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