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Chapter 4
Vocab Terms
29
Chemistry
10th Grade
03/07/2012

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Term
Electromagnetic Radiation
Definition
Form of energy that exhibits wavelike behavior as it travels through space.
Term
Electromagnetic Spectrum
Definition
All the forms of electromagnetic radiation.
Term
Wavelength
Definition
Distance between corresponding points on adjacent waves
Term
Constant Speed of Light (Scientific Notation)
Definition
3.00 x 10^8
Term
Frequency
Definition
Number of waves passed through a given point in a specific time.
Term
Equation to find wavelength or frequency
Definition
Constant of Light (c) = Wavelength x (v)
Term
Photoelectric Effect
Definition
Emission of electrons from a metal when light shines on the metal.
Term
Quantum
Definition
of energy is the minimum quantity of energy that can be lost or gained by an atom.
Term
Equation to find Energy or Frequency
Definition
E=hv
Term
Planck's Theory
Definition
6.626 x 10^-34
Term
What did Einstein propose?
Definition
That electromagnetic radiation has a dual-wave particle nature.
Term
Photon
Definition
particle of electromagnetic radiation having zero mass and carrying a quantum of energy.
Term
Ground state
Definition
lowest energy state of an atom
Term
Excited state
Definition
state in which an atom has a higher potential energy than it has in its ground state.
Term
Emission-line Spectrum
Definition
When a narrow beam of light shines through a prism and separates into four specific colors of the visible spectrum.
Term
Continuous Spectrum
Definition
The emission of a continuous range of frequencies of electromagnetic radiation.
Term
Heisenburg Uncertainty Principle
Definition
States that it is impossible to determine simultaneously both the position and velocity of an electron or any other particle.
Term
Quantum Theory
Definition
Describes mathematically the wave properties of electrons and other very small particles.
Term
Orbital
Definition
Three-dimensional region around the nucleus that indicates the probable location of an electron.
Term
Quantum Numbers
Definition
Specify the properties of atomic orbitals and the properties of electrons in orbitals.
Term
Principal Quantum Number
Definition
Indicates the main energy level occupied by an electron. (n) Equation is; n^2 to calculate the number of orbitals. 2n^2 is to calculate the number of electrons in a level.
Term
Angular Momentum Electron
Definition
symbolized by (L), indicates the shape of the orbital.
n = 0; S
n = 1; P
n = 2; D
n = 3; F
Equation is; n - 1
Term
Magnetic Quantum Number
Definition
symbolized by (m), indicates the orientation of an orbital around the nucleus.
Term
Spin
Definition
Clockwise (Up Arrow and +1/2), Counter Clockwise (Down arrow and -1/2)
Term
Electron Configuration
Definition
Arrangements of electrons in an atom.
Term
Aufbau Principle
Definition
An electron occupies the lowest-energy orbital that can receive it.
Term
Pauli Exclusion Principle
Definition
No two electrons in the same atom can have the same set of four quantum numbers.
Term
Hund's Rule
Definition
orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron, and all electrons in singly occupied orbital must have the same spin state.
Term
Noble Gas Configuration
Definition
Refers to an outer main energy level occupied, in most cases, eight electrons.
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