NEET > Chemistry Class 12 > Group-18 Elements: Properties
Group-18 Elements: Properties Video Lecture - Chemistry Class 12 - NEET
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FAQs on Group-18 Elements: Properties Video Lecture - Chemistry Class 12 - NEET
| 1. What are the properties of Group-18 elements? |  |
Ans. Group-18 elements, also known as noble gases, have several unique properties. They are odorless, colorless, and tasteless gases at room temperature. These elements have low boiling and melting points, indicating their low reactivity. Additionally, noble gases are characterized by their stable electron configurations, as they have a full outer shell of electrons.
| 2. How do noble gases behave under normal conditions? | |
Ans. Noble gases are known for their inertness and lack of reactivity. They do not readily form compounds with other elements and are considered chemically stable. This is due to their full valence electron shells, which makes them highly unreactive. Under normal conditions, noble gases exist as monatomic gases, meaning they consist of individual atoms rather than molecules.
| 3. What are the applications of noble gases? | |
Ans. Noble gases have various practical applications due to their unique properties. For instance, helium is commonly used in balloons and airships due to its low density. Neon is used in neon signs and fluorescent lights to produce colorful light. Argon is utilized in light bulbs to prevent the filament from oxidizing. Additionally, noble gases are used in cryogenics, as coolants, and in the medical field for imaging purposes.
| 4. Why are noble gases called "noble"? | |
Ans. Noble gases are called "noble" due to their lack of reactivity compared to other elements. The term "noble" was initially used to emphasize their inertness and resistance to forming compounds. In the past, only gold, silver, and platinum were considered noble due to their resistance to corrosion. When noble gases were discovered and found to exhibit similar unreactive behavior, they were given the same title.
| 5. Can noble gases form compounds under certain conditions? | |
Ans. Although noble gases are generally unreactive, it is possible for them to form compounds under specific conditions. However, these compounds are highly unstable and only exist under extreme conditions such as high pressures and temperatures. Examples of noble gas compounds include xenon hexafluoride (XeF6) and krypton difluoride (KrF2). These compounds are synthesized in laboratories and are not naturally occurring.
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