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25 Cards in this Set

  • Front
  • Back
Brownian Motion
Haphazard Movement of tiny particles suspended in a gas or liquid resulting from bombardment by the fast-moving molecules of the gas or liquid.
Chemical Reaction
Process of rearrangement of atoms that transforms one molecule into another.
amu
Abbreviation for atomic mass unit.
Antiproton
Antiparticle of a proton; a negatively charged proton.
Meson
Elementery particle with an atomic weight of zero; can participate in the strong interaction.
Mach Number
Ratio of the speed of an object to the speed of sound. For example, an aircraft traveling at the speed of sound is rated Mach 1.0 traveling at twice the speed of sound, Mach 2.0.
Periodic Table
Chart that lists elements by atomic number and by electron arrangements, so that elements with similar chemical properties are in the same column (group). See figure 11.9, page 203.
Atomic Mass Number
Number associated with an atom, equal to the number of nucleons (protons plus neutrons) in the nucleus.
Oxidize
Chemical process in which an element or molecule loses one or more electrons.
Ion
Atom (or group of atoms bound together) with a net electric charge, which is due to the loss or gain of electrons. A positive ion has a net positive charge. A negative ion has a net negative charge.
Tau
Atom (or group of atoms bound together) with a net electric charge, which is due to the loss or gain of electrons. A positive ion has a net positive charge. A negative ion has a net negative charge.
Neutron
Electronically neutral particle that is one of the two kinds of nucleons that compose an atomic nucleus.
Atom
Smallest particle of an element that has all the element's chemical properties. Consists of protons and neutrons in a nucleus surrounded by electrons.
Atomic Number
Number associated with an atom, equal to the number of protons in the nucleus, or equivelently, to the number of electrons in the electron cloud of a neutral atom.
Antiparticle
Particle having the same mass as a normal particle, but a charge of the opposite sign. The antiparticle of an electron is a positron.
Compound
Chemical substance made of atoms of two or more different elements combined in a fixed proportion.
Electron
Negative particel in the shell of an atom.
Proton
Positively charged particle that is one of the two kinds of nucleons in the nucleus of an atom.
Mixture
Substances mixed together without combining chemically.
Neutron Star
Star that has undergone a gravitational collapse in which electrons are compressed into protons to form neutrons.
Dark Matter
Unseen and unidentified matter that is evident by its gravitational pull on stars in the galaxies.
Chemical Formula
Description that uses numbers and symbols of elements to describe the proportions of elements in a compound or reaction.
Positron
Antiparticle of an electron; a positively charged electron.
Model
Representation of an idea created to make the idea more understandable.
Atomic Mass (amu)
Standard unit of atomic mass. It is based on the mass of the common carbon atom, which is arbitrarily given the value of exactly 12. An amu of 1 is one-twelfth the mass of this common carbon atom.