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Ch.13 - Solids & Modern Materials
Chapter 13, Problem 44d

Identify each solid as molecular, ionic, or atomic. d. Xe(s)

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Step 1: Understand the types of solids: Molecular solids are composed of molecules held together by intermolecular forces. Ionic solids consist of ions held together by ionic bonds. Atomic solids are composed of atoms held together by covalent bonds, metallic bonds, or weak dispersion forces.
Step 2: Identify the chemical nature of the substance: Xenon (Xe) is a noble gas, which means it is composed of individual atoms rather than molecules or ions.
Step 3: Consider the type of forces present: In the solid state, noble gases like xenon are held together by weak dispersion forces (also known as London dispersion forces).
Step 4: Classify the solid: Since xenon is composed of individual atoms and held together by weak dispersion forces, it is classified as an atomic solid.
Step 5: Conclude the classification: Therefore, Xe(s) is an atomic solid.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Molecular Solids

Molecular solids are composed of molecules held together by intermolecular forces such as van der Waals forces, dipole-dipole interactions, or hydrogen bonds. These solids typically have low melting and boiling points compared to ionic or atomic solids. Examples include ice (solid water) and sugar. The properties of molecular solids are largely influenced by the types of molecules and the strength of the intermolecular forces present.
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Ionic Solids

Ionic solids consist of positively and negatively charged ions held together by strong electrostatic forces known as ionic bonds. These solids generally have high melting and boiling points due to the strength of the ionic interactions. Common examples include sodium chloride (table salt) and magnesium oxide. Ionic solids are typically brittle and can conduct electricity when melted or dissolved in water, as the ions are free to move.
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Atomic Solids

Atomic solids are composed of atoms held together by covalent bonds, metallic bonds, or van der Waals forces, depending on the type of atomic solid. They can be further categorized into covalent network solids, like diamond, which have very high melting points, and metallic solids, which conduct electricity and heat well. The arrangement and bonding of atoms in these solids determine their physical properties, such as hardness and conductivity.
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