Questions: element or compound type of solid formed force holding the solid together melting point of solid ------------ CH3Br ? ? ✓ Os ? ✓ ? Ar ? ✓ ? ? ? ✓

Transcript text: \begin{tabular}{|c|c|c|c|} \hline \begin{tabular}{c} element \\ or \\ compound \end{tabular} & \begin{tabular}{c} type of solid \\ formed \end{tabular} & \begin{tabular}{c} force holding the solid \\ together \end{tabular} & \begin{tabular}{c} melting point \\ of solid \end{tabular} \\ \hline $\mathrm{CH}_{3} \mathrm{Br}$ & $?$ & $?$ & $\checkmark$ \\ \hline Os & $?$ & $\checkmark$ & $?$ \\ \hline Ar & $?$ & $\checkmark$ & $?$ \\ \hline & $?$ & $?$ & $\checkmark$ \\ \hline \end{tabular}

Solution

Solution Steps

Step 1: Determine the Type of Solid for Each Element or Compound

CH$_3$Br: This is a molecular compound. Molecular compounds typically form molecular solids, which are held together by intermolecular forces such as dipole-dipole interactions, London dispersion forces, and hydrogen bonds (if applicable). In the case of CH$_3$Br, the primary force is dipole-dipole interactions due to the polar nature of the molecule.
Os (Osmium): Osmium is a metal, and metals form metallic solids. These solids are held together by metallic bonds, which involve a "sea of electrons" that are delocalized over a lattice of metal cations.
Ar (Argon): Argon is a noble gas, and noble gases form atomic solids. These are held together by weak London dispersion forces, as they are nonpolar and consist of individual atoms.

Step 2: Identify the Force Holding the Solid Together

CH$_3$Br: As mentioned, the force holding the solid together is primarily dipole-dipole interactions.
Os (Osmium): The force holding the solid together is metallic bonding.
Ar (Argon): The force holding the solid together is London dispersion forces.

Step 3: Determine the Melting Point of the Solid

CH$_3$Br: Molecular solids generally have low melting points compared to ionic or metallic solids. The melting point of CH$_3$Br is relatively low due to the weak intermolecular forces.
Os (Osmium): Metallic solids typically have high melting points. Osmium, being a transition metal, has a very high melting point.
Ar (Argon): Atomic solids formed by noble gases have very low melting points due to weak London dispersion forces.

Final Answer

CH$_3$Br: Type of solid: Molecular solid; Force: Dipole-dipole interactions; Melting point: Low
Os: Type of solid: Metallic solid; Force: Metallic bonding; Melting point: High
Ar: Type of solid: Atomic solid; Force: London dispersion forces; Melting point: Low

\[ \begin{array}{|c|c|c|c|} \hline \text{Element or Compound} & \text{Type of Solid} & \text{Force Holding the Solid Together} & \text{Melting Point} \\ \hline \mathrm{CH}_{3} \mathrm{Br} & \text{Molecular} & \text{Dipole-dipole interactions} & \text{Low} \\ \hline \text{Os} & \text{Metallic} & \text{Metallic bonding} & \text{High} \\ \hline \text{Ar} & \text{Atomic} & \text{London dispersion forces} & \text{Low} \\ \hline \end{array} \]

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