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Chapter 5
electrons in atoms
19
Chemistry
10th Grade
10/27/2008

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Term
energy levels
Definition
fixed energies an electron can have
Term
quantum
Definition
amount of energy required to move an electron from one energy level to another
Term
quantum mechanical model
Definition
modern description of electrons in atoms; determines allowed energies an electron can have & probability of finding electron in various locations around nucleus
Term
atomic orbital
Definition
region of space in which there is a high probability of finding an electron
Term
electron configuration
Definition
way in which electrons are arranged in various orbitals around nuclei of atoms
Term
aufbau principle
Definition
electrons occupy orbitals of lowest energy first
Term
pauli exclusion principle
Definition
an atomic orbital may describe at most 2 electrons, each with opposite spin direction
Term
hund's rule
Definition
electrons occupy orbitals of same energy in a way that makes the number of electrons with same spin direction as large as possible; school bus rule
Term
amplitude
Definition
wave's height from zero to crest
Term
wavelength
Definition
distance between crests
Term
frequency
Definition
number of wave cycles to pass a given point per unit of time
Term
hertz
Definition
SI unit of cycles per second
Term
electromagnetic radiation
Definition
energy waves that travel in a vacuum at a speed of 2.998 x 10^8 m/s (includes radio waves, microwaves, infrared waves, visible light, ultraviolet waves, x-rays, gamma rays)
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
pattern formed when light passes through prism/diffraction grating to separate it into different frequencies of light it contains
Term
ground state
Definition
lowest possible energy of electron
Term
photons
Definition
light quanta; discrete bundles of electromagnetic energy that interact with matter similarly to particles
Term
heisenberg uncertainty principle
Definition
impossible to know both velocity and position of particle at same time
Term
photoelectrons
Definition
sometimes produced when light shines on metals
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