Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke4605.&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 4605. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Theoretical Concepts And Tools, Theoretical Concepts
Scientific paper
The second lightest element which, after hydrogen, is the second most abundant in the universe. The most abundant isotope of the neutral helium atom consists of a nucleus made up of two protons and two neutrons around which revolve two electrons. The atomic mass is 4, and the atomic number (i.e. charge on the nucleus) is 2. The nucleus of such a helium atom is also known as an alpha particle. Hel...
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