Helium (from Ancient Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, non-toxic, inert, monatomic gas …

Dec 4, 2025 · Helium, chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element, helium is a colorless, odorless, and tasteless gas that becomes …

Element Helium (He), Group 18, Atomic Number 2, s-block, Mass 4.003. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.

Helium was first identified in 1868 by astronomers studying the sun. It is the second most common element in the universe, with only hydrogen being more abundant. Here on Earth, …

Nov 13, 2025 · Helium is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gases group in the periodic table. It is the second lightest element in the …

Helium is an inert gas and does not easily combine with other elements. There are no known compounds that contain helium, although attempts are being made to produce helium …

The second most abundant element in the universe, helium is a product of nuclear fusion and radioactive decay. It is the lightest noble gas, colorless, odorless, and inert with a low boiling …

Helium is used for a lot more than party balloons. In its most important use, liquid helium is used to cool MRI machines in hospitals. Its diverse properties allow helium gas and liquid helium to …

Feb 22, 2023 · Helium element, with the symbol He and atomic number 2, is the second most abundant chemical element in the universe. It is a colorless, odorless, tasteless, non-toxic, …

Helium (2 He) has nine known isotopes, but only helium-3 (3 He) and helium-4 (4 He) are stable. All radioisotopes are short-lived; the only particle-bound ones are 6 He and 8 He with half-lives …