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4&11
4&11
16
Science
9th Grade
06/07/2011

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Term
element
Definition
a pure substance that cannot be separated or broken down into simpler substances by physical or chemical means
Term
metals
Definition
elements that are shiny and are good conductors of thermal energy and electric current
Term
nonmetals
Definition
elements that are dull and are poor conductors of thermal and electric current
Term
metalloids
Definition
elements that have properties of both metals and nonmetals
Term
malleable
Definition
can be flattened with a hammer witout shattering
Term
ductile
Definition
the ability of a substance to be drawn or pulled into a wire
Term
compound
Definition
a pure substance composed of two or more elements that are chemically combined
Term
mixture
Definition
a combination of two or moresubstances that are not chemically combined
Term
solution
Definition
a mixture that apears to be a single substance but is composed of particles of two or more substances that are distributed evenly amongst each other
Term
atom
Definition
the smallest particle into which an element can be divided and still be the same substance
Term
electrons
Definition
the negativley charged particles found in all atoms
Term
neutrons
Definition
the particles of the nucleus that have no charge
Term
protons
Definition
the positivley charged particles of the nucleus
Term
nucleus
Definition
the tiny extremely dense positivley charged region in the center of an atom
Term
electron clouds
Definition
the region inside an atom where electrons are likely to be found
Term
atomic number
Definition
the number of protons in the nucleus of an atom
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