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Chapter 11 Vocab
Holt Physical Science
13
Science
8th Grade
03/30/2009

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Term
atom
Definition
the smallest particle into which an element can be divided and still be the same substance.
Term
theory
Definition
a unifying explanation for a broad range of hypotheses and observationd that have been supported by testing
Term
electrons
Definition
the negatively charged particles found in all atoms; electrons are involved in the formation of chemical bonds.
Term
model
Definition
a representaion of and object or system
Term
nucleus
Definition
the tiny, extremely dense, positively charged region in the center of an atom; made up of protons and nuetrons.
Term
electron clouds
Definition
the regions inside an atom where electrons are likely to be found.
Term
atomic mass
Definition
the weighted average of the masses of all the naturally recurring isotopes of an element.
Term
mass number
Definition
the sum of the protons and nuetrons in an atom.
Term
protons
Definition
the positively charged particles of the nucleus; the number of protons in a nucleus is the atomic number that determines the identity of an element.
Term
atomic mass unit (amu)
Definition
the SI unit used to express the masses of particles in atoms.
Term
nuetrons
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 have different nubers of nuetrons.
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