Thomson’s
plum-pudding model,
- a sphere with a uniformly distributed
positive charge and enough embedded electrons to neutralize the positive
charge. A plum pudding is a sort of cake with raisins embedded in it.
Rutherford
atomic model.
- the atom is like a miniature
solar system, with electrons orbiting around a massive nucleus, and as mostly
empty space, with the nucleus occupying only a very small part of the atom.
Bohr
model of the atom
- electrons travel in defined circular orbits
around the nucleus. The orbits are labeled by an integer, the quantum number n.
Electrons can jump from one
orbit to another by emitting or absorbing energy.
Quantum
model
- Instead of orbits, there were orbitals or regions
of space with high probability of finding
electrons.
These are known as electron clouds or electron subshells.
•
There is no real “empty space,” but there are regions with a high or low
probability of
finding an electron
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