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Quantum Physics
n/a
22
Chemistry
11th Grade
01/25/2009

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Term
According to the Quantum Mechanics model of the atom, the electron is...
Definition
A 3-dimensional wave surrounding the nucleus of an atom. The electrons are in fixed energy states and can move about the nucleus without radiating away their energy.
Term
Principle Quantum Number (n)
Definition
Indicates the average distance that an electron is located from the nucleus of the atom.
Term
What is the maximum number of electrons possible in any given energy level where n=the energy level equal to?
Definition
2n^2
Term
Orbital Quantum Number (l)
Definition
Indiactes the shape of the path in which electrons move. These paths are called sublevels.
Term
Where are electrons placed in a given energy sublevel?
Definition
The lowest energy sublevel first.
Term
Magnetic Quantum Number (ml)
Definition
Indicates the direction and space of the path of a pair of electrons. This direction is called an orbital.
Term
Orbital
Definition
A three-dimensional space about the nucleus in which electrons of a given energy are likely to be found.
Term
The maximum number of orbitals in a given energy level is equal to...
Definition
n^2
Term
Spin Quantum Number (ms)
Definition
Indicates the spin or rotation of the electron on its axis.
Term
Pauli's Exculsion Principle
Definition
States that no more than two electrons can occupy the same orbital in an atom and these two electrons must have opposite spins.
Term
Electron Pair
Definition
Two electrons in the same orbital with opposite spins.
Term
Valence Electrons
Definition
The electrons in the outermost energy level of the atom.
Term
What is the most important part of the electron configuration? Explain.
Definition
The valence electrons are the most important part of the electron configuration. The number and arrangement of the valence electrons determine the chemical properties of an element.
Term
Kernel
Definition
The entire electron configuration excluding the valence electrons.
Term
Ground State
Definition
The lowest energy state of an atom. The atom's most stable state.
Term
Spectroscopy
Definition
The method of studying substances that are exposed to some sort of continous exciting energy.
Term
What causes the bright light spectrum?
Definition
If an outside force causes an electron to change orbitals, energy is either given off or absorbed by definate units called Quanta. This change produces the bright light spectrum of the substance.
Term
What is true about spectrums of different substances?
Definition
Each is unique.
Term
What is found through studying the spectrum?
Definition
The energy diagram for the location of the electrons.
Term
Spectrum
Definition
A unique set of wave-lengths absorbed by a substance.
Term
Hund's Rule
Definition
When placing electrons in a sublevel that has more than one orbital, one electron of the same spin is placed in each orbital before doubling up.
Term
Aufbau Principle
Definition
Electrons are placed one at a time in the lowest energy position.
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