A compound is formed by three elements A ,B and C . Atoms of element B

1.	A compound is formed by three elements A ,B and C . Atoms of element B form hcp lattice . One eighth of tetrahedral void occupied by atoms of element A and One half of octahedral void occupied by atoms of element B . Formula of the compound is
Answer» ong>ANSWER: Given that, atoms of B forms hcp lattice. So, the atoms at corners are shared by 6 unit cells. So, its contribution is 6 1 ; Face centered atoms contribute 2 1 and middle layer atoms contribute 1 each. So, effective number of atoms in unit cell = 6 1 ×12+ 2 1 ×2+1×3 =2+1+3=6 Number of tetrahedral voids =2× Number of atoms forming the lattice. =2×6=12 So, number of atoms of A= 3 2 ×12=8 Number of atoms of B=6 So, A:B⇒A:B 8:6 4:3 So, formula is A 4 B 3

A compound is formed by three elements A ,B and C . Atoms of element B form hcp lattice . One eighth of tetrahedral void occupied by atoms of element A and One half of octahedral void occupied by atoms of element B . Formula of the compound is

Answer»

Given that, atoms of B forms hcp lattice. So, the atoms at corners are shared by 6 unit cells. So, its contribution is

; Face centered atoms contribute

and middle layer atoms contribute 1 each.

So, effective number of atoms in unit cell =

×12+

×2+1×3

=2+1+3=6

Number of tetrahedral voids =2× Number of atoms forming the lattice.

=2×6=12

So, number of atoms of A=

×12=8

Number of atoms of B=6

So, A:B⇒A:B

8:6 4:3

So, formula is A