Atoms. Physics Montwood High School R. Casao. More than 100 different elements have been discovered. Each element consists of atoms that contain: a number of protons Z, an equal number of electrons , and a number of neutrons N. The number of protons Z is called the atomic number.
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The Bohr Model
Energy in a Circular Orbit
circular orbit of radius r about
a positive charge Z·e such as
the nucleus of a hydrogen
atom (Z = 1).
can be related to the radius of
The electron in the hydrogen atom can move only in certain nonradiating, circular orbits called stationary orbits.
where n = 1, 2, …
ħ = = 1.055 x 10-34 J·s = 6.582 x 10-16 eV·s
Energy Levels equation:
and whose wavelength is