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Chapter 5
Electrons in Atoms
19
Chemistry
10th Grade
09/28/2007

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Term
wavelength
Definition
shortest distance between equivalent points on a wave
Term
frequency
Definition
number of waves that pass a given point per second
Term
amplitude
Definition
height from the origin to a crest or a trough
Term
electromagnetic spectrum
Definition
encompasses all forms of electromagnetic radiation
Term
quantum
Definition
minimum amount of energy that can be lost or gained by an atom
Term
photoelectric effect
Definition
exhibits particle-like behavior or light
Term
photon
Definition
particle of light equal to one quantum of energy
Term
ground state
Definition
lowest allowable energy state of an atom
Term
Heisenberg uncertainty principle
Definition
it is impossible to know both the velocity and position of a particle at the same time
Term
atomic orbital
Definition
probable location of an electron around the nucleus
Term
principal quantum number
Definition
indicates the relative sizes and energies of atomic orbitals
Term
principal energy level
Definition
numbered from lowest energy closest to the nucleus
Term
energy sublevels
Definition
divisions designated as s, p, d, and f
Term
electron configuration
Definition
arrangement of electrons in an atom
Term
aufbau principle
Definition
each electron occupies the lowest energy level available
Term
Pauli exclusion principle
Definition
two electrons per orbital with opposite spins
Term
Hund's rule
Definition
equal energy levels fill with one electron before pairing
Term
valence electrons
Definition
electrons in the outermost orbital
Term
electron-dot structure
Definition
element symbol surrounded by valence electrons
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