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Element Helium (He), Group 18, Atomic Number 2, s-block, Mass 4.003. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
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The number of atoms of the element per 1 million atoms of...
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- Gadolinium
Atomic number The number of protons in an atom. Electron...
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- Videos of Helium
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, tasteless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table.
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.
Helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C. It has two stable isotopes, helium-3 and helium-4, with different physical and chemical properties.
21 de nov. de 2020 · Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. The chemical symbol for Helium is He. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table.
27 de ene. de 2020 · Helium is element number 2 on the periodic table with atomic number 2 and element symbol He. It is the lightest noble gas, the second most abundant element in the universe, and has many applications in science and industry.
Helium is a noble gas with atomic number 2 and mass number 4. It has low density, melting and boiling points, and is abundant in the universe but rare on Earth. Learn more about its history, electron configuration, applications, and isotopes.
