What is H?

H is the elemental symbol of hydrogen.

Hydrogen is a chemical element with symbol H, ranking first in the periodic table of elements. Hydrogen usually exists in the form of hydrogen, which is colorless, tasteless and odorless. It is a highly flammable gas composed of diatomic molecules, and hydrogen is the lightest gas. Hydrogen is used to treat diseases in medicine.

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Hydrogen (H2) was first synthesized at the beginning of16th century. At that time, the metal was put into strong acid. During the period of 1766 ~ 8 1, Henry cavendish discovered that hydrogen is another gas different from that previously discovered. When it burns, it will produce water, which also determines the Latin name "hydrogenium" (meaning "water-producing substance"). At normal temperature and pressure, hydrogen is a colorless, transparent, odorless and tasteless gas that is easy to burn.

Hydrogen atoms are easily reduced. Hydrogen is very active at high temperature. Almost all elements can form compounds with hydrogen except rare gas elements.