Identify and Describe Types of Unit Cells in Crystalline Solids

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12 Terms

1

Which of the following best describes the term simple cubic unit cell?

A simple cubic unit cell is a unit cell in the simple cubic structure.
A simple cubic unit cell is defined as the unit cell in the simple cubic structure.

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2

How many atoms will fit inside one simple cubic unit cell?

1

The simple cubic unit cell will fit one eighth of eight different atoms, which total to one atom.

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3

The number of particles that each particle in a crystalline solid contacts is called the:

coordination number

The coordination number will tell us how many particles are adjacent to an individual particle in the solid lattice.

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4

The simplest unit cell is the:

simple cubic unit cell

The simple cubic unit cell essentially consists of repeating cubes.

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5

In a simple cubic unit cell, what percentage of the volume is occupied by atoms?

Only 52.4% of a simple cubic unit cell is occupied, which makes it a relatively inefficient way to arrange atoms in a crystalline solid.

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6

Within a crystalline structure, a coordination number corresponds to

the number of spheres that touch the sphere in question.

A coordination number refers to the number of other spheres (atoms) that each sphere in a crystalline solid contacts.
For example, an atom in a simple cubic lattice structure contacts six other atoms, so it has a coordination number of six.

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7

Which of the following is a crystalline structure in which close packed layers of atoms or ions are stacked as a series of two alternating layers of different relative orientations?

Hexagonal close packing

Hexagonal closest packing is defined as a crystalline structure in which close packed layers of atoms or ions are stacked as a series of two alternating layers of different relative orientations.

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8

Which of the following is the definition of cubic close packing?

Cubic close packing is a crystalline structure in which planes of closely packed atoms or ions are stacked as a series of three alternating layers of different relative orientations.

Cubic close packing is defined as a crystalline structure in which planes of closely packed atoms or ions are stacked as a series of three alternating layers of different relative orientations.

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9

When considering the composition of different types of unit cells of metals, we find that simple cubic unit cells _______.

have atoms occupying about 52% of the total volume

Simple cubic unit cells have atoms occupying about 52% of the total volume.

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10

Which of the following gives the definition of body-centered cubic solid?

A body-centered cubic solid is a crystalline structure that has a cubic unit cell with lattice points at the corners and in the center of the cell.
A body-centered cubic solid is defined as a crystalline structure that has a cubic unit cell with lattice points at the corners and in the center of the cell.

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11

When considering the net number of atoms contained in different types of unit cells of metals, we find that face-centered unit cells contain how many atoms?

Face-centered unit cells contain a net total of four atoms.

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12

A coordination number is described by which of the following?

A coordination number is the number of atoms closest to any given atom in a crystal or to the central metal atom in a complex.

A coordination number is defined as the number of ions or atoms immediately surrounding a central atom in a crystal or to the central metal atom in a complex.

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