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Matter & the Periodic Table
n/a
27
Science
7th Grade
10/14/2008

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Term
solvent
Definition
liquid that dissolves a solute
Term
solution
Definition
homogeneous mixture; when a solute is dissolved by a solvent
Term
solute
Definition
that which is dissolved by a solvent
Term
atomic number
Definition
reveals the number of protons in a particular atom
Term
mass number
Definition
the total number of protons plus neutrons in the nucleus of an atom
Term
periods
Definition
rows on the Periodic Table
Term
groups
Definition
columns on the Periodic Table
Term
neutrons
Definition
neutral particles in the nucleus of an atom
Term
nonmetals
Definition
mostly gas; on the right of the zig zag on the Periodic Table
Term
noble gases
Definition
not reactive; group 18
Term
halogens
Definition
very reactive;fluorine, chlorine, bromine and iodine
Term
halogens
Definition
very reactive;fluorine, chlorine, bromine and iodine
Term
metalloids
Definition
have properties of both metals and nonmetals
Term
valence electrons
Definition
those electrons in the outer orbit that are involved in chemical bonding
Term
compound
Definition
two or more elements chemically combined
Term
formula
Definition
group of symbols and subscripts that represent a compound
Term
molecule
Definition
two or more atoms chemically combined
Term
subscript
Definition
small number in a formula that reveals the number of atoms being represented
Term
mixtures
Definition
combination of substances that are easity taken apart or separated
Term
homogeneous mixture
Definition
a mixture that is evenly mixed throughout; solutions
Term
density
Definition
grams per cubic centimeter OR grams per milliliter
Term
density formula
Definition
mass/volume
Term
liquid
Definition
no definite shape but a definite volume
Term
soluable
Definition
the ability to dissolve
Term
pure substance
Definition
opposite of mixture; examples would be elements, compounds
Term
NaCl
Definition
sodium chloride;salt
Term
AlCl3
Definition
aluminum chloride
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