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Intro Chem A Final

Matter Has mass and occupies space.
Cathode ray Glowing beam that traveled from cathode to anode.
Isotopes Atoms that have the same number of protons but different number of neutrons.
Atomic mass Element weighted average mass of atoms in a naturally occurring sample of the element.
Quantum Amount of energy required to move an electron from one energy level to another.
Aufbau principle Electrons occupy orbitals of lowest energy first.
Pauli exclusion principle Atomic orbital may describe at most two electrons.
Spin Quantum mechanical property of electrons.
Hund's rule Electrons occupy orbitals of same energy in a way that makes the number of electrons with the same spin direction as large as possible.
Amplitude Wave's height from zero to the crest.
Hertz SI unit of cycles per second.
Electromagnetic radiation Includes radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays and gamma rays.
Spectrum Sunlight passing through a prism separates them into different wavelengths.
Atomic emission spectrum Wavelengths of spectral lines are characteristics of the element.
Planck's constant (n) has value of 6.626 x 10^-34 J*s
Photoelectric effect Electrons are ejected when light shines on metal.
Heisenburg uncertainity principle States that it is impossible to know both velocity and position of a particle at the same time.
Radioisotopes Unstable isotope nuclear reactions begin with.
Alpha particle Two protons and neutrons has double positive charge.
Beta particle Electron result from breaking apart from a neutron in an atom.
Gamma Ray High energy photon emitted by radioisotope.
Nuclear Force Attractive force that acts between all nuclear particles that are extremely close together.
Band of stability Region of the graph in which these points are located.
Positron Particle with mass of an electron but a positive charge.
-Half-life Amount of time for substance to decay in half.
Transmutation Conversion of atom of one element into atom of another element.
Transuranium elements Elements with atomic numbers above 92.
Fission Nuclei of certain isotopes are bombarded with neutrons.
Neutron moderation Process that slows down neutrons so reactor fuel can capture them to continue chain reaction.
Neutron absorption Process that decreases the number of slow-moving neutrons.
Created by: MakStabs18