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Chapter 11 Key Terms
Vocabulary words
13
Science
8th Grade
03/14/2008

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Term
Theory
Definition
A unifying explaination for a broad range of hypothesys and observations that have been supported by testing
Term
Atom
Definition
The smallest praticle into which an element can be divided and still be the same substance
Term
Electrons
Definition
The negatively chrged particles found in all atoms
Term
Model
Definition
A representation of an object or system
Term
Nucleus
Definition
the tiny, extremely dense, positively chrged region in the center of an atom
Term
Electron Clouds
Definition
The region inside an atom where electrons are likely to be found
Term
Protons
Definition
The positively chraged particles of the nucleus
Term
Atomic Mass Unit(AMU)
Definition
The Si unit used to express the masses of the particles in an atom
Term
Neutrons
Definition
The particles of the nucleus that have no charge
Term
Atomic Number
Definition
The number of protons in the nucleus of an atom
Term
Isotopes
Definition
Atoms that have the same number of protons, but different numbers of neutrons
Term
Mass Number
Definition
The sum of the protons and neutrons in an atom
Term
Atomic Mass
Definition
The weighed average of the masses of the naturally occuring isotopes of an element
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