Because an atomic nucleus of helium is 0.7% lighter than the four hydrogen nuclei that it's created from, that act of nuclear fusion releases a tremendously efficient amount of energy.

Now, researchers have created and interrogated a novel kind of helium atom in which one of the electrons is replaced by a sub-atomic particle known as a pion. The work could shed light on the nature ...

For example, a helium atom has an atomic mass of 4, but an atomic number (or positive charge) of 2. Since electrons have almost no mass, it seemed that something besides the protons in the nucleus ...

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.

Limits of atomic nuclei predicted Scientists simulate large region of the chart of nuclides Date: January 13, 2021 Source: Technische Universitat Darmstadt Summary: Novel calculations have enabled ...

Investigations employing laser-cooled atomic beams and improved frequency metrology have paved the way for sub-kHz accuracy in determining fine-structure splittings, bolstering our confidence in ...

Helium, with an atomic weight of four, fits into the neutral position between hydrogen and lithium. Argon, with an atomic weight of about forty, as naturally falls into the neutral position ...