Chapter 11: Introduction to Modern Atomic Theory
We see an electron 'orbiting' the nucleus at a
In the Quantum Mechanical model we view the behavior
of the electron in a completely different way...the
electron occupies an orbital.
But in the Bohr model we describe the electron in an
To get the electron to move from the orbit closest to
the nucleus to a 'higher' orbit, we must add energy. The
electron must absorb some energy to 'excite' the electron
to a higher orbit.
Each of the orbits is also called an energy level,
because the electron has a certain energy when it is in
an orbit. The orbit closest to the nucleus is the lowest
energy level, and the electron has the smallest amount of
To excite the electron to a higher orbit we must add
the exact amount of energy, the differnece between the
energies of the two levels, to cause the electron to move
to the higher energy level.
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