Explanation
The space occupied in sc, bcc and fcc and hcp structures are 52%, 68%,74% and 74% respectively. Hence, the close packing is maximum in the crystal lattice of face centred cubic and hexagonal close packing.
Hence, the correct options are B and D
The space occupied in hcp, ccp, bcc and fcc structures are 74%, 74%, 68% and 74% respectively. Thus, bcc is not a close packing.
Hence, the correct option is C
The co-ordination numbers of an element in fcc, hcp and bcc crystal lattice are 12, 12 and 8 respectively. Hence, if the coordination number of an element in its crystal lattice is 8, then packing is bcc.
At zero kelvin, most of the ionic crystals posses no defect. This is due to presence of highly ordered arrangement.
a \neq b \neq c
\alpha=\beta=\gamma=90^{\circ}
3 types:-
1. Body centred orthorhombic: lattice point in middle of unit cell.
2. Base centerd: lattice point in middle of each of 2 ends.
3. Face centred = middle of each side.
Wurtzite is a zinc iron sulfide mineral frequently encountered mineral form of sphalerite.
Hence, option B is correct.
Which of the following is an amorphous substance?
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