_________ is an imaginary line about which if the crystal be rotated, it will present the same appearance more than once during the course of complete revolution.
centre of symmetry
axis of symmetry
plane of symmetry
elements of symmetry
In ________ there is a structural particles at the center of each face in addition to a structural particle at each corner of the unit cell.
Primitive
Face centered
Body centered
End centered
Atomic crystals have no independent _________.
ions
atoms
elements
molecules
Which bond holds together the carbon atoms in the molecular sheets of graphite?
molecular bonds
co ordinate bond
single covalent bonds
metallic bonds
The sides or edges of the unit cell are called cell ________.
lattice
dimensions
properties
structure
Which bonds connect the carbon atoms in a diamond crystal?
valence bond
covalent bond
coordinate bond
ionic bond
Which energy do the mobile electrons of metallic crystal give up heat the cooler region?
Thermal energy
Heat energy
Kinetic energy
Electric energy
Graphite is a covalent network crystal but what is its exceptional property?
high melting point
low volatile
bad conduction
good conduction
Which of the following are soft crystal?
ionic crystals
covalent molecular crystals
covalent network crystals
metallic crystals
Crystalline solids exhibit
anisotropy
isotropy
isopoly
heteropoly
