Which of the following is NOT a characteristic of ionic compounds?

Ionic compounds are typically characterized by their structure and bonding between cations (positively charged ions) and anions (negatively charged ions). One key feature is that they have high melting points, which is a result of the strong electrostatic forces of attraction between the oppositely charged ions. This strong attraction necessitates a significant amount of energy to separate the ions, hence the high melting points.

When dissolved in water, ionic compounds dissociate into their constituent ions, allowing them to conduct electricity. This property is crucial for understanding their behavior in solutions and is a defining characteristic of ionic substances.

Since ionic compounds are composed of cations and anions, this structural makeup is integral to their properties, including their electrical conductivity when dissolved and their high melting points.

In the context of the options, the assertion that ionic compounds are gases at room temperature does not align with the traits typically observed in ionic compounds. Instead, these compounds tend to exist as solid crystals at room temperature, reflecting the robust nature of the ionic bonds holding them together.