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Questions and Answers
Which type of lattice has atoms present at corners as well as the body center in a cubic unit cell?
Which type of lattice has atoms present at corners as well as the body center in a cubic unit cell?
- Hexagonal close-packed
- Simple cubic
- Face-centered cubic
- Body-centered cubic (correct)
How many crystal systems are there based on symmetry grouping?
How many crystal systems are there based on symmetry grouping?
- 32
- 230
- 4
- 7 (correct)
Which lattice type has parameters a=b=c, α=β=γ=90°?
Which lattice type has parameters a=b=c, α=β=γ=90°?
- Monoclinic
- Tetragonal
- Cubic (correct)
- Orthorhombic
Which type of lattice has arrangements of atoms/ions in four different ways including primitive, bcc, fcc, and ecc?
Which type of lattice has arrangements of atoms/ions in four different ways including primitive, bcc, fcc, and ecc?
What type of solids have an irregular shape and an indefinite melting point?
What type of solids have an irregular shape and an indefinite melting point?
Which type of solids are compressible and may undergo clean cleavage?
Which type of solids are compressible and may undergo clean cleavage?
Which nature of solids includes Diamond, Copper, and NaCl as examples?
Which nature of solids includes Diamond, Copper, and NaCl as examples?
Which type of solid has a definite heat of fusion and is rigid and incompressible?
Which type of solid has a definite heat of fusion and is rigid and incompressible?
In a body-centered cubic structure, what is the coordination number?
In a body-centered cubic structure, what is the coordination number?
What is the packing efficiency in a face-centered cubic crystal structure?
What is the packing efficiency in a face-centered cubic crystal structure?
How many crystal systems are there according to the text?
How many crystal systems are there according to the text?
What is the relationship between the radius of an atom and the lattice parameter in a simple cubic unit cell?
What is the relationship between the radius of an atom and the lattice parameter in a simple cubic unit cell?
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Study Notes
Lattice Types and Structures
- A body-centered cubic (BCC) lattice features atoms located at the corners and a singular atom in the body center of the cube.
- Face-centered cubic (FCC) and primitive (P), body-centered cubic (BCC), and end-centered cubic (ECC) configurations represent four distinct arrangements of atoms/ions.
Crystal Systems
- There are seven crystal systems classified based on symmetry grouping.
- Parameters a=b=c and angles α=β=γ=90° characterize a cubic crystal system.
Types of Solids
- Irregular-shaped solids with indefinite melting points are classified as amorphous solids.
- Compressible solids capable of clean cleavage are generally termed as brittle solids.
- Examples of solids in the nature category include Diamond (covalent), Copper (metallic), and Sodium Chloride (ionic).
Properties of Solids
- Solids with a definite heat of fusion, rendered rigid and incompressible, fall under the category of crystalline solids.
- In a body-centered cubic (BCC) structure, the coordination number is eight, indicating that each atom is surrounded by eight nearest neighbors.
- Packing efficiency in a face-centered cubic (FCC) crystal structure is approximately 74%.
Atomic and Lattice Relationships
- In a simple cubic unit cell, the relationship between the radius of an atom and the lattice parameter can be described by the equation: a = 2r, where "a" is the lattice parameter and "r" is the atomic radius.
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