Helium | Definition, Properties, Uses, & Facts | Britannica
网页2024年8月16日 · helium (He), chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element (only hydrogen is lighter), helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C (−452 °F).
Helium - Wikipedia
网页Helium (from 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 and the first in the noble gas group in the periodic table.
Helium - Element information, properties and uses | Periodic Table
网页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, Chemical Element - structure, uses, elements, metal, gas ...
网页Helium is the second most abundant element in the universe. Only hydrogen occurs more often than helium. Helium is also the second simplest of the chemical elements. Its atoms consist of two protons, two neutrons, and two electrons. Only the hydrogen atom is simpler than a helium atom.
Helium (He) - Physical & Chemical Properties, Uses, Isotopes
网页Helium is the element which you can find on the upper right side of the periodic table with atomic number 2. It comes first amongst the family of noble gases. It holds one atomic orbital and was named by Lockyer and Frankland.
Helium Facts (Atomic Number 2 or He) - ThoughtCo
网页2021年9月2日 · Helium is atomic number 2 on the periodic table, with the element symbol He. It is a colorless, flavorless gas, best known for its use in filling floating balloons. Here is a collection of facts about this lightweight, interesting element:
Helium(He) - Definition, Preparation, Properties, Uses, …
网页2024年9月17日 · Helium – A noble gas with the chemical symbol He and atomic number 2, Helium is renowned for its inertness and lighter-than-air properties. It’s the second most abundant element in the universe, primarily formed through nuclear fusion in stars.
helium summary | Britannica
网页helium, Chemical element, chemical symbol He, atomic number 2. A noble gas, it is colourless, odourless, tasteless, completely unreactive, and nontoxic. First found by spectroscopy of the Sun’s atmosphere in 1868, it is the second most abundant and second-lightest element in the universe (after hydrogen).
Helium Facts - Atomic Number 2 or He - Science Notes and …
网页2015年5月18日 · Helium is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table. Helium is the second lightest and second most abundant element in the universe .
Helium (He) - Periodic Table
网页Helium is the 2nd element in the periodic table and has a symbol of He and atomic number of 2. It has an atomic weight of 4.00260 and a mass number of 4. Helium has two protons and two neutrons in its nucleus, and two electrons in one shell.