Scientists concluded that electrons occupy specific energy levels by exciting atoms of different elements with UV light and watching the light emitted as the electrons fall back to ground state. Different elements had different characteristic emissions each time.
J J Thomson could be considered the discoverer of electron paths around the nucleus, and later quantum work by folk such as Pauli, Planck, and so on. Becquerel and Rutherford may also be considered founding members of this club.
The quantum theories essentially disallow two particles with identical properties in a given energy level.
Have a crack at some of these names in wikipedia.org, and also for electron.
Niels Bohr.
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Isotope
Niels Bohr
In this model, the electrons move or orbit around the protons that are at the center of the atom. Electrons move around the nucleus, which contains the proton, in orbits that have a definite size and energy.
Electrons flow around the nucleus
Electrons move around the atomic nucleus.
Protons, neutrons and electrons are located in the atom. The protons and neutrons are located in the atomic nucleus; the electrons are around the nucleus, arranged in shells.
The scientist who discovered that atoms have an energy level is Niels Bohr in 1913. According to his model electrons move around the nucleus much the same as the planets rotate around the sun.
Ernest Rutherford
Niels Bohr
Niels Bohr
In this model, the electrons move or orbit around the protons that are at the center of the atom. Electrons move around the nucleus, which contains the proton, in orbits that have a definite size and energy.
J.J Thompson
John Balcock discovered that electrons can never be exactly found around an atom.
A shell surrounding the nucleus of an atom containing electrons.
They are not in the nucleaus, they orbit around the nucleus.
Electrons. They have a negative charge.
No, the electrons are around the nucleus, not in the nucleus.
An electron doesn't have specific orbital path about an atomic nucleus. They move in specific energy levels that we identify as specific electron orbitals. But recall that the area where the electrons hang out is called the electron cloud. It's a "fuzzy zone" where electrons may be found. Electrons don't have specific routes about any atomic nucleus.
Electrons orbit the nucleus in specific shells. The K shell is the closest to the nucleus, and is followed by the L, M, N, O, and P shells, which move further out as the letter increases.