Krypton

Krypton is a chemical element with the symbol Kr and atomic number 36. It belongs to the group of noble gases on the periodic table, along with helium, neon, argon, xenon, and radon. Krypton is a colorless, odorless, tasteless noble gas, which occurs in trace amounts in the atmosphere. It is obtained through the distillation of liquid air.

Physical Properties:

• Atomic Number: 36
• Atomic Mass: 83.798 amu
• Phase at Room Temperature: Gas
• Boiling Point: -153.22°C
• Melting Point: -157.36°C
• Density: 3.749 g/L

Chemical Properties:

Krypton is considered to be a noble gas, and as such, it is relatively inert. It has a complete set of valence electrons, making it highly stable and unreactive. Krypton is used in certain lighting applications, such as in high-powered, long-lived light bulbs and fluorescent lamps.

Applications:

Aside from its use in lighting, krypton has some niche applications. It is used in some types of photographic flash lamps and in certain types of lasers. Krypton-85, a radioactive isotope of krypton, is used in nuclear reactors as a coolant. Krypton is also used in some types of insulation materials.

Study Guide:

When studying krypton, it's important to understand its position on the periodic table, its physical and chemical properties, as well as its applications. Here are some key points to focus on:

1. Understand the position of krypton on the periodic table, including its atomic number and mass.
2. Learn about the physical properties of krypton, such as its phase at room temperature, boiling and melting points, and density.
3. Explore the chemical properties of krypton as a noble gas, including its stability and lack of reactivity.
4. Examine the various applications of krypton, including its use in lighting, lasers, and nuclear reactors.
5. Consider the environmental and economic impact of extracting and using krypton.