Helena Joyce
The noble gases are a group of stable chemical elements that seldom react with other chemical elements. They are colourless, odourless, tasteless, nonflammable gases that are found in the eighteenth group of the periodic table. While no noble gas is considered a pollutant, radon (Rn) is a radioactive noble gas that is produced as a result of the radioactive decomposition of radium compounds.
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Radon (Rn)
Radon is present in the Earth's atmosphere, although in smaller concentrations compared to other noble gases. It can be found in trace amounts in the troposphere, the lowest layer of the Earth's atmosphere, along with other gases such as nitrogen, oxygen, argon, carbon dioxide, neon, helium, methane, and krypton. While these gases are vital for maintaining healthy natural environments and supporting life, human-made chemicals can negatively impact the atmosphere and lead to air pollution.
As an indoor air pollutant, radon can accumulate in buildings and pose health risks to occupants. It is released from the natural decay of uranium in the soil and can enter homes through cracks in foundations, construction joints, gaps around service pipes, and gaps in suspended floors and walls. Radon can also be present in water supplied from lakes and reservoirs, which can then release the gas into the air during showering or other household activities.
The radioactive nature of radon and its decay products makes them hazardous when inhaled. Radon progeny, or decay products, can attach to airborne dust and dust particles, which can then be deposited in the lungs. This increases the risk of developing lung cancer, as the radiation emitted damages lung tissue and cells. According to the United States Environmental Protection Agency (EPA), radon is the second-leading cause of lung cancer in the United States, with about 21,000 deaths attributed to radon-related lung cancer each year.
To mitigate the risks associated with radon exposure, regular testing and mitigation systems are recommended. Testing can be done through short-term and long-term methods, with short-term tests taking a few days to check for quick results, and long-term tests providing a more comprehensive understanding of the average radon levels over a period of 3 to 12 months. Radon mitigation systems can then be installed to reduce radon levels in homes, which typically involve ventilation and sealing techniques to prevent radon from entering and accumulating in indoor spaces.
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Krypton (Kr)
Krypton has a variety of applications due to its unique properties. It is often used in lighting and photography, as its multiple emission lines produce a whitish light. Krypton-based bulbs are particularly useful in high-speed photography and for creating white light sources. Additionally, krypton is combined with other gases such as argon and mercury to create luminous signs and energy-efficient fluorescent lamps.
One notable application of krypton is in the field of metrology. From 1960 to 1983, the official definition of the meter was based on the wavelength of light emitted by the isotope krypton-86. This definition replaced the previous prototype meter and served as the standard for over two decades.
While krypton has useful applications, one of its isotopes, krypton-85 (85Kr), is considered a pollutant and is highly toxic. It is produced by the fission of uranium and plutonium, such as in nuclear bomb testing and nuclear reactors. Exposure to krypton-85 can lead to serious health issues, including cancer, thyroid disease, and disorders of the skin, liver, or kidneys. Its radioactive nature and long half-life of 10.76 years contribute to its persistence in the environment.
The presence of krypton-85 in the environment is a concern, especially near nuclear facilities and areas with high levels of nuclear activity. Its release during the reprocessing of fuel rods from nuclear reactors can lead to increased concentrations in certain regions, such as the North Pole, due to convective mixing. The potential impact of krypton-85 pollution on human health and the environment underscores the importance of proper handling and containment of this isotope.
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Xenon (Xe)
Xenon is a member of the zero-valence elements, often called noble or inert gases. It is generally unreactive and inert to most common chemical reactions, including combustion, due to its full outer valence shell of eight electrons, which produces a stable, minimum energy configuration. However, it can undergo a few chemical reactions, such as the formation of xenon hexafluoroplatinate, the first noble gas compound synthesized in 1962 by Neil Bartlett. Since then, many other xenon compounds have been discovered, and almost all known xenon compounds contain the electronegative atoms fluorine or oxygen.
Xenon has several unique physical and chemical properties. It has a boiling point of 166.6 K and a melting point of 161.7 K. It emits a blue or lavenderish glow when excited by an electrical discharge and is used in specialized light sources such as flash lamps, arc lamps, and ruby lasers. It is also used as a general anesthetic and in ion thrusters for spacecraft propulsion. Xenon difluoride is used in the manufacture of 5-fluorouracil, a drug used to treat certain types of cancer.
Xenon is not considered a pollutant. It is naturally present in the Earth's atmosphere and has no known biological role. While it is used in various industrial and medical applications, there is no indication that it has harmful effects on the environment or human health when used appropriately. However, some compounds containing xenon, such as xenon difluoride, are highly toxic due to their strong oxidizing properties.
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Argon (Ar)
Argon is widely used in various industrial applications, including as an inert "blanketing" gas to prevent the presence of air over highly reactive chemicals. It is also used in welding and other high-temperature processes, as well as in the production of lightbulbs and fluorescent lights. Due to its inert nature, Argon does not typically react with other substances and is often used to prevent chemical reactions.
One potential hazard associated with Argon is the risk of asphyxiation due to oxygen displacement in the atmosphere. As Argon is undetectable by normal human senses, individuals may unknowingly enter equipment or areas where Argon has been used, resulting in exposure to oxygen-deficient atmospheres. This hazard is significant given Argon's widespread industrial use.
The separation and recovery of Argon from air is a complex and energy-intensive process. It involves cryogenic temperatures and distillation techniques to separate Argon from oxygen and nitrogen. The high energy costs associated with this process have driven the development of alternative methods, such as membrane-assisted distillation.
Despite being classified as an indoor air pollutant, Argon itself is not inherently harmful. Its presence as an impurity, particularly in high concentrations, can be detrimental. For example, Argon can reduce the performance of fuel cells when present in high levels, although it does not affect their lifetime. Overall, while Argon may have negative consequences in certain contexts, it is important to recognise that its inert and unreactive nature makes it a valuable resource in various industrial applications.
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No inert gas is an air pollutant
The noble gases are a group of chemical elements that make up Group 18 (historically Group 0) of the periodic table. They include helium, neon, argon, krypton, xenon, radon, and sometimes oganesson. These gases are called "noble" because they are reluctant to react chemically with other elements, due to their full valence shell of electrons. This inertness is also why they are sometimes referred to as inert gases.
Inert gases are used in a variety of applications, including in the chemical industry, in oil refineries, and on board commercial and military aircraft, to prevent undesirable chemical reactions from taking place. For example, inert gases are used to prevent fires and explosions by keeping the oxygen content of a tank atmosphere below 5%. They are also used to preserve historical documents and perishable foods by preventing oxidation.
While inert gases can be used to mitigate the effects of air pollutants, they are not, themselves, air pollutants. Air pollutants are substances that negatively impact human health and the environment. Human-made air pollutants include nitrogen dioxide and carbon monoxide, which are found in vehicle exhaust, as well as tobacco smoke, which is considered the most important indoor air pollutant.
In summary, while noble gases are used in a variety of applications, including the prevention of fires and the preservation of food and historical documents, they are not considered air pollutants. Air pollutants refer to substances that negatively impact human health and the environment, and noble gases do not fall into this category.
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Frequently asked questions
None of the noble gases are considered pollutants.
Noble gases are a group of stable chemical elements with low chemical reactivity. They seldom react with other chemical elements.
Helium, Neon, Argon, Krypton, Xenon, and Radon are some examples of noble gases.
Noble gases are colourless, odourless, tasteless, nonflammable, and monatomic gases.
In chemistry and alchemy, the word 'noble' signifies the reluctance of metals to undergo chemical reactions.
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