Though atomic nuclei are often depicted as static clusters of protons and neutrons (nucleons), the particles are actually ...

Immediately after the Big Bang, which occurred around 13.8 billion years ago, the universe was dominated by unimaginably high ...

Allmendinger, T. (2025) A Planar Atom Model of Helium Based on Well-Defined Electron Trajectories. Journal of Applied ...

According to a study published in Astronomy and Astrophysics, researchers from Max-Planck-Institut für Kernphysik (MPIK) in Heidelberg have uncovered fresh information on the reaction pathways of the ...

Researchers have taken atomic diffraction to a new level, revealing surprising behaviors in high-energy helium and hydrogen atoms. By passing these particles through single-layer graphene, they ...

Its atomic nucleus has two protons and two neutrons (hence the 4 after the abbreviation for the element); in helium-3, one of the neutrons is missing.

Theoretical physics last week again proved that it has substance. The lightest element, hydrogen, has an atomic weight of 1.0078. The helium atom, next lightest in the table of elements, weighs 4. ...

References [1] Precision spectroscopy of atomic helium. National Science Review (2020). [2] Atomic Structure Calculations of Helium with Correlated Exponential Functions. Symmetry (2021).