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Electrons
Electrons
19
Chemistry
10th Grade
11/21/2010

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Term
energy levels
Definition
the fixed energies an electron can have
Term
quantum
Definition
the amount of energy required to move an electron from one energy level to another energy level
Term
quantum mechanical model
Definition
the modern description of the electrons in atoms
Term
atomic orbital
Definition
a region in space in which there is a high probability of finding an electron
Term
electron configurations
Definition
the ways in which electrons are arranged in various orbitals around the nuclei of atoms
Term
aufbau principle
Definition
electrons occupy the orbitals of lowest energy first
Term
Pauli exclusion principle
Definition
an atomic orbital may describe at most two electrons
Term
Hund's rule
Definition
when electrons occupy orbitals of equal energy,one electron enters each orbital until all the orbitals contain one electron with parallel spins
Term
amplitude
Definition
the wave's height from zero to crest
Term
wavelength
Definition
the distance between two consecutive wave crests
Term
frequency
Definition
the number of wave cycles to pass a given point per unit of time; represented by v
Term
hertz
Definition
SI unit of cycles per second; can also be expressed as a reciprocal second
Term
electromagnetic radiation
Definition
includes radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays; travels at a speed of 2.998 x 10^8
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
atomic emission spectrum
Definition
the pattern formed when light passes through a prism or diffraction granting to separate it into the different frequencies of light it contains
Term
ground state
Definition
when the electron has its lowest possible energy
Term
photons
Definition
light quanta
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
de Broglie's equation
Definition
predicts that all matter exhibits wave-like motion
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