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Chemistry Chapter 5 Vocab
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18
Chemistry
12th Grade
01/05/2011

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Term
Amplitude
Definition
the height of a wave’s crest
Term
Atomic Emission Spectrum
Definition
the pattern formed when light passes through a prism or diffraction grating to separate it into the different frequencies of light it contains
Term
Atomic Orbital
Definition
a mathematical expression describing the probability of finding an electron at various locations; usually represented by the region of space around the nucleus where there is a high probability of finding an electron
Term
Aufbau Principle
Definition
the rule that electrons occupy the orbitals of lowest energy first
Term
Electromagnetic Radiation ("EMR")
Definition
energy waves that travel in a vacuum at a speed of 2.998 X 108m/s; includes radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rayst
Term
Electron Configurations
Definition
the arrangement of electrons of an atom in its ground state into various orbitals around the nuclei of atoms
Term
Energy Levels ("Shells")
Definition
the specific energies an electron in an atom or other system can have
Term
Frequency
Definition
the number of wave cycles that pass a given point per unit of time; frequency and wavelength are inversely proportional to each othert
Term
Ground State
Definition
the lowest possible energy of an atom described by quantum mechanics
Term
Heisenberg Uncertainty Principle
Definition
it is impossible to know exactly both the velocity and the position of a particle at the same time
Term
Hertz
Definition
the unit of frequency, equal to one cycle per secondt
Term
Hund's Rule
Definition
electrons occupy orbitals of the same energy in a way that makes the number or electrons with the same spin direction as large as possible
Term
Pauli Exclusion Principle
Definition
an atomic orbital may describe at most two electrons, each with opposite spin direction
Term
Photons
Definition
a quantum of light; a discrete bundle of electromagnetic energy that interacts with matter similarly to particles
Term
Quantum
Definition
the amount of energy needed to move an electron from one energy level to another
Term
Quantum Mechanical Model
Definition
the modern description, primarily mathematical, of the behavior of electrons in atoms
Term
Spectrum
Definition
wavelengths of visible light that are separated when a beam of light passes through a prism; range of wavelengths of electromagnetic radiation
Term
Wavelength
Definition
the distance between adjacent crests of a wave
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