The Fascinating World of Helium

Helium, a noble gas with the symbol He and atomic number 2, is located at the topmost right of the periodic table. It is known for its stability due to its two valence electrons. Helium was first observed in the sun's spectrum and later isolated on Earth by Sir William Ramsay. Despite its limited valence electrons, helium shares properties with other noble gases, being inert and non-reactive. It is widely used in cryogenics, medical equipment, and as a lifting gas for balloons. Helium is also used in leak detection and arc welding. However, inhaling helium can be dangerous as it displaces oxygen, posing a risk of suffocation.

What is the chemical symbol and atomic number of helium?

Why is helium considered the most stable noble gas?

Who first isolated terrestrial helium and how?

What are some of the main uses of helium in various applications?

What precautions should be taken when using helium, especially regarding inhalation?