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Questions and Answers
Which characteristic is NOT true for crystalline solids?
Which characteristic is NOT true for crystalline solids?
- They have a definite geometric shape.
- They have a well-defined melting point.
- They exhibit long-range order of atoms.
- They are isotropic in nature. (correct)
What is the term for the three-dimensional arrangement of atoms in a crystalline solid?
What is the term for the three-dimensional arrangement of atoms in a crystalline solid?
- Molecular framework
- Atomic structure
- Unit cell
- Crystal lattice (correct)
In a face-centered cubic (FCC) structure, how many atoms are effectively present in the unit cell?
In a face-centered cubic (FCC) structure, how many atoms are effectively present in the unit cell?
- 6
- 2
- 8
- 4 (correct)
What is packing efficiency in the context of crystal structures?
What is packing efficiency in the context of crystal structures?
Which of the following statements is characteristic of amorphous solids?
Which of the following statements is characteristic of amorphous solids?
Flashcards
Amorphous Solids
Amorphous Solids
Solids that lack a regular, repeating arrangement of atoms or molecules. Their structure is more like a liquid, with no long-range order.
Crystalline Solids
Crystalline Solids
Solids that have a well-defined and repeating three-dimensional arrangement of atoms or molecules. They have a long-range order.
Unit Cell
Unit Cell
The basic three-dimensional repeating unit in a crystal lattice. It's like a building block that repeats to form the entire crystal.
Packing Efficiency
Packing Efficiency
The percentage of space in a unit cell that is occupied by atoms. It tells us how efficiently atoms are packed in a crystal.
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Voids (in a crystal lattice)
Voids (in a crystal lattice)
Empty spaces within a crystal lattice. They can be small (like tetrahedral or octahedral voids) or large (like cubic voids).
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Solid State
- Solids are classified into different types, including amorphous and crystalline solids
- Crystal lattices, unit cells, and crystal systems are important concepts to study
- Packing efficiency, voids, and the number of atoms per unit cell are crucial aspects of solid-state structures.
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