In the case of lead-208—the heaviest stable isotope known so far—a team of researchers led by physicist Jack Henderson ...

Bohr suggested the revolutionary idea that electrons "jump" between energy levels (orbits) in a quantum fashion, that is, without ever existing in an in-between state. Thus when an atom absorbs or ...

Earth has a nearly circular orbit, but some planets outside our solar system, called exoplanets, have very elliptical orbits. UCLA astrophysicists have now measured the shape of the orbits of ...

Nobel prize-winning physicist Niels Bohr described these electrons in the atom as existing in a shell structure. The ...

An atom is made of tiny negatively charged electrons ... Changes to the atomic model Electrons move in fixed orbits, called electron shells, around the nucleus.