Question

basis of similarities and differences between metallic and ionic
crystals.
(ii) Ionic solids are hard and brittle.
Calculate the efficiency of packing in case of a metal crystal for
(i) simple cubic
(ii) body-centred cubic
(iii) face-centred cubic (with the assumptions that atoms are touching
each other).
Silver crystallises in fcc lattice. If edge length of the cell is 4.07 x 108
cm and density is 10.5 g cm3, calculate the atomic mass of silver.
A cubic solid is made of two elements P and Q. Atoms of Q are at the
corners of the cube and P at the body-centre. What is the formula of the
compound? What are the coordination numbers of P and Q?
Niobium crystallises in body-centred cubic structure. If density is 8.55
g cm3, calculate atomic radius of niobium using its atomic mass 93 u.
If the radius of the octahedral void is r and radius of the atoms in close-
packing is R, derive relation between r and R.​

Answer 1

Answer:

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