The least dense element is helium. Helium is a colorless, odorless, and tasteless gas that is the second lightest and second most abundant element in the universe. It has an atomic number of 2 and is represented by the symbol He on the periodic table.

Helium is unique in that it remains a liquid at temperatures close to absolute zero, making it an important element in cryogenics and superconductivity research. It is also widely used in industries such as aerospace, healthcare, and electronics.

Despite its abundance in the universe, helium is relatively rare on Earth. It is typically extracted from natural gas deposits, where it is found in small concentrations. Due to its low density, helium is often used to fill balloons and airships, as it is less dense than air and provides buoyancy.

Helium is also used in various medical applications, such as MRI machines and breathing mixtures for deep-sea diving. In addition, helium is used in the production of semiconductors, fiber optics, and leak detection equipment.

If you would like to learn more about the properties and uses of helium, you can visit the following websites for more information:

• Royal Society of Chemistry - Helium
• Live Science - Helium Facts
• Chemicool - Helium Element

In conclusion, helium is the least dense element and has a wide range of uses in various industries. Its unique properties make it a valuable resource for scientific research and technological advancements.

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