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The number of nearest particles which is in direct contact with a particle in a closed packed structure
Crystal system characterized by a ≠ b≠ c and α = β = γ = 90o
Smallest repeating unit of crystal lattice
In a primitive unit cell atoms are present at the
Corners & Centers of any 2 opposite sides
Corners and Body Centre
Corners & Centers of all faces
Based on the nature of intermolecular forces, classify the following solids : Silicon carbide
What type of material is this one?
Which of the following is an amorphous solid?
Quartz glass (SiO2)
Silicon carbide (SiC)
Sodium Chloride (NaCl)
The type of crystalline solid which is a good conductor in solid as well as molten state?
For orthorhombic system axial ratios are a b c and the axial angles are:
α = β = γ ≠ 90
α ≠ β ≠ γ ≠ 90
α = β = γ = 90
α ≠ β ≠ γ = 90
A collection of geometrical points in 3-d space arranged in a regular periodic manner is called ________
Which of the following is not correct?
Crystalline solids are anisotropic.
Lattice + Basis = Crystal
The various crystal planes are specified by a set of three numbers called Miller indices.
All Unit cells are Primitive cells.
The lattice site in a pure crystal cannot be occupied by ___________
Which of the following is not a characteristic of a crystalline solid?
Definite and characteristic heat of fusion.
Long range order or perfect arrangement of constituent particles
Isotropic in nature
clean cleavage or smooth edges on cutting with a knife
Which of the following is a network solid or covalent crystalline solid?
Calcium Fluoride (CaF2)
Iron Metal (Fe)
Crystalline solids are