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Physics
Chapter 11
21
Physics
Undergraduate 2
03/25/2006

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Term
Atoms
Definition
Tiny building blocks made up of mostly empty space, which make up matter. Can combine to form molecules.
Term
Brownian Motion
Definition
Perpetual jiggling of particles resulting from collisions between visible particles and invisible atoms.
Term
Atomic Nucleus
Definition
Where nearly all the mass of an atom is concentrated.
Term
Thermonuclear Fusion Reaction
Definition
When nuclei of 2 or more atoms are squashed into contact.
Term
Nucleon
Definition
Principal building block of the nucleus
Term
Neutron
Definition
Nucleon in an electrically neutral state.
Term
Proton
Definition
Nucleon in an electrically charged state (positively charged).
Term
Element
Definition
When a substance is composed of atoms of the same kind.
Term
Atomic Number
Definition
Number of protons in an atom.
Term
Noble Gases
Definition
Helium,Neon,Argon,Krypton, and Radon.
Term
Quantum Mechanics
Definition
The theory of the small-scale world that includes predicted wave properties of matter.
Term
Isotopes
Definition
Atoms of the same element that contain different numbers of neutrons.
Term
Mass Number
Definition
Used to identify isotopes, The total number of protons and neutrons in the nucleus.
Term
Atomic Mass
Definition
The total mass of an atom (sum of the masses of all the atom's components).
Term
Compound
Definition
A pure chemical material that consists of more than one kind of atom.
Term
Mixture
Definition
A substance that is mixed together with out chemically bonding.
Term
Molecule
Definition
Consists of 2 or more atoms held together by the sharing of electrons.
Term
Chemical Reaction
Definition
Any process in which atoms rearrange to form different molecules.
Term
Antimatter
Definition
Composed of atoms with negative nuclei and positive electrons.
Term
Positrons
Definition
Positive electrons.
Term
Dark Matter
Definition
Matter we can't see that tugs on stars and galaxies that we can see.
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