In a diamond cubic (dc) structure, calculate
`Z_("eff")`

In an hcp structure, calculate Z_("eff)

Iron crystallises in a body centred cubic structure. Calculate the radius of iron atom if edge length of unit cell is 286 pm.

Platinum (atomic radius = 1.38 Å ) crystallises in a cubic closed packed structure. Calculate the edge length of the face-centred cubic unit cell and the density of the platinum (Pt = 195)

A compound formed by elements X and Y has a cubic structure in which X atoms are at the corner of the cube and Y atoms are at the face centres. One atoms X is misssing from the corner. a. Calculate (i). Z_(eff') (ii). total number of the atoms in the cube, and (iii). formula of the compound. b. If alll the atoms are removed from one of the faces of the cube containing atoms at corners, as in (a) above, calculate (i) Z_(eff') (ii) total number of atoms in a cube, and (iii) formula of the compound.

A compound formed by elements X and Y has a cubic structure in which X atoms are at the corner of the cube and also at the face centers. Y atoms are present at the body centre and at the edge centre of the cube. a. Celculate (i) Z_(eff') (ii) total number of atoms in the cube, and (iii) formula of the compound. b. If all the atoms are removed from one of the body diagonals of the cube, calculate (i) Z_(eff') (ii) total number of atoms in the cube, and (iii) formula of the compound. c. If all the atoms from the diagonals of the one of the face of the cube are removed, calculate (i) Z_(eff') (ii) total number of atoms in the cube, and (iii) formula of the compound. d. If all the atoms are removed from one of the plane passing through the middle of t he cube, calculate (i) Z_(eff') (ii) total number of atoms in the cube, and (iii) formula of the compound. e. If all the atoms are removed from one of the axes passing through one of the face centres of the cube, calculate (i) Z_(eff') (ii) total number of atoms in the cube, and (iii) formula of the compound.

The refractive indices of glycerine and diamond with respect to air are 1.4 and 2.4 respectively. Calculate the speed of light in glycerine and diamond. From these results, calculate the refractive index of diamong with respect to glycerine. (c=3 xx 10^(8)m//s)

A compound formed by elements X and Y has a cubic structure in which X atoms are at the corners of the cube of and two atoms (Y) are at each body diagonal of the cube. a. Calculate: (i) Z_(eff') (ii) total number of atoms in a cube, and (iii) formula of the compound. b. If all atoms form one body diagonal of the cube except corners are removed, calculate: (i) Z_(eff') (ii) total number of atoms in the cube, and (iii) formula of the compound.

KCl has NaCl type face centred cubic crystal structure and CsF has CsCl type cubic crystal structure. Calculate the ratio of densities of CsF and KCl it is given that the molar mass of CsF is two that of KCl and edge length of KCl unit cell of 1.5 times that for CsF .

Lead sulphide has face centred cubic crystal structure. If the edge length of the unit cell of lead sulphide is 495 pm, calculate the density of the crystal. (at. Wt. Pb =207, S=32)

A metal (atomic mass = 40) has a body centred cubic crystal structure. If the density of the metal is 4.50 g cm^(-3) , calculate the volume of the unit cell.