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Helium is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, and inert gas that heads the noble gas group in the periodic table. Its boiling and melting points are the lowest among all the elements and it exists only as a gas except in extreme conditions. Helium was first discovered in 1868 by French astronomer Jules Janssen and British astronomer Joseph Norman Lockyer during a solar eclipse. The element is named after the Greek god of the sun, Helios . Helium is the second lightest element and is almost seven times lighter than air. It is widely used in cryogenics, as it has the lowest boiling point of any element, and is used to cool materials and instruments to extremely low temperatures. Helium is also used in the production of semiconductors, fiber optics, welding, and as a lifting gas for balloons and airships. The supply of helium is limited, and its price has increased in recent years due to concerns over its av

Hydrogen is the chemical element with the symbol H and atomic number 1. It is the lightest and most abundant element in the universe, constituting about 75% of its elemental mass. In its most common form, hydrogen exists as a diatomic molecule (H2), which is a colorless, odorless, and tasteless gas . Hydrogen is highly reactive and can form compounds with almost all other elements. It is used in a wide range of industrial applications, such as in the production of ammonia for fertilizers, in petroleum refining, and in the manufacture of various chemicals. It is also used as a fuel for vehicles, either in its pure form or as a component of other fuels like natural gas. Hydrogen has attracted attention in recent years as a potential clean energy source. When hydrogen is burned or reacted with oxygen in a fuel cell, it produces only water and releases a significant amount of energy. However, the production of hydrogen itself often involves the use of fossil fuels, so it is not