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An electron's location or momentum, but not both.
Quantum mechanics deals with probabilities - where an electron might be found, for example. It's very difficult to put in lay terms, but "Quantum Reality" by Nick Herbert is very readable, and accurate.
The energy level the electron is in
Quantum mechanics explains the unpredictable nature of the electron (and of subatomic particles in general).
Expound on quantum mechanics can be less than 200 words. You have to make sure it has all the details and information.
Particle or wave? It is both or either, depending on how it is observed, as is everything else in quantum mechanics.
The specific orbital the electron is in
The energy level the electron is in
The energy level an electron gives
Sommerfield's model is a semi quantum-mechanics, a classical free electron model. However, it differs from the Drude's model since it is incorporate in a quantum mechanics idea such that : - Only discrete energy levels are allowed for the electron. - Together with the Pauli Exclussion Principle and Fermi-Dirac statistic which deal with the probability of occupancy of the energy states by electron. - The density of available states for the electron occupancy.
Principles of Quantum Mechanics was created in 1930.
Sommerfield's model is a semi quantum-mechanics, a classical free electron model. However, it differs from the Drude's model since it is incorporate in a quantum mechanics idea such that : - Only discrete energy levels are allowed for the electron. - Together with the Pauli Exclussion Principle and Fermi-Dirac statistic which deal with the probability of occupancy of the energy states by electron. - The density of available states for the electron occupancy.