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A helium atom is an atom of the chemical element helium. Helium is composed of two electrons bound by the electromagnetic force to a nucleus containing two protons along with two neutrons, depending on the isotope, held together by the strong force.
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.
Element Helium (He), Group 18, Atomic Number 2, s-block, Mass 4.003. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Jump to main content
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). The boiling and freezing points of helium are lower than those of any other known substance.
- The Editors of Encyclopaedia Britannica
The helium atom has two electrons bound to a nucleus with charge Z = 2. The successive removal of the two electrons can be diagrammed as. He I1 → He + + e − I2 → He + + + 2e −. The first ionization energy I1, the minimum energy required to remove the first electron from helium, is experimentally 24.59 eV.
18 de may. de 2015 · Helium Facts – Atomic Number 2 or He 1. This entry was posted on May 18, 2015 by Todd Helmenstine (updated on February 21, 2023) Periodic Table cell for the element Helium. Basic Helium Facts. Name: Helium. Atomic Number: 2. Element Symbol: He. Group: 18. Period: 1. Block: s. Element Family: Noble Gas. Atomic Mass: 4.002602 (2)
Formula: He. Molecular weight: 4.002602. IUPAC Standard InChI: InChI=1S/He. IUPAC Standard InChIKey: SWQJXJOGLNCZEY-UHFFFAOYSA-N. CAS Registry Number: 7440-59-7. Chemical structure: This structure is also available as a 2d Mol file. Permanent link for this species. Use this link for bookmarking this species for future reference.
