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The helium-4 atom. The helium atom is the second simplest atom (hydrogen is the simplest), but the extra electron introduces a third "body", so its wave equation becomes a "three-body problem", which has no analytic solution.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 2) and isobaric (same nucleon number A = 4) with Helium-4. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
…protons and one neutron, and helium-4 (or 4 He), with two protons and two neutrons. 4 He forms the bulk of naturally occurring helium, but the lighter isotope 3 He has been formed, since about 1950, in experimentally useful quantities by the decay of tritium produced in nuclear reactors.
Helium-4 (also written 4 He) is an isotope of helium. It is the most common isotope of helium in the universe. Out of all the helium on the Earth, 99.99986% is helium-4. The nucleus (the center) of a helium-4 atom is also known as the alpha particle.
Helium 4 is a complete tetrahedron. It consists of 4 protons in a triangular shape with 2 inner electrons. The other 2 electrons are in the outer orbital (complete S-orbital). He4 is stable and can be seen as 2 Deuterium nuclei merged together.
Encyclopedia. Helium-4 is a non- radioactive and light isotope of helium. It is by far the most abundant of the two naturally-occurring isotopes of helium, making up about 99.99986% of the helium on earth. Its nucleus is a boson and an alpha particle, having two protons and two neutrons.
helium-4 atom: ChEBI ID CHEBI:30219: Definition The stable isotope of helium with relative atomic mass 4.002603. The most abundant (99.99 atom percent) isotope of naturally occurring helium. Stars This entity has been manually annotated by the ChEBI Team.
