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Chemistry
15-30
15
Religious Studies
7th Grade
11/23/2008

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Cards

Term
periodic table
Definition
organizes information about the elements and their properties
Term
atomic mass
Definition
average mass of one atom of an element---protons + neutrons
Term
atomic number
Definition
the number of protons in the nucleus of an atom---the number of protons identifies the element
Term
group
Definition
elements in the same column; have similar physical and chemical properties
Term
period
Definition
a row across a table
Term
malleable
Definition
a material that can be pounded into shapes
Term
ductile
Definition
a material that can be pulled out, or drawn, into a long wire
Term
conductor
Definition
elements that can transmit heat and electricity easily
Term
magnetic
Definition
attracted to magnets or can be made into magnets
Term
corrosion
Definition
the process of reaction and wearing away
Term
alloy
Definition
a mixture of metals: brass is an alloy of copper and zinc
Term
nonmetal
Definition
elements that lack most of the properties of metals; located to the right of the zigzag line
Term
diatomic molecule
Definition
when molecules contain 2 atoms
Term
noble gas
Definition
elements in Group 18; do not ordinarily form compounds with other elements
Term
metalloid (semiconductor)
Definition
elements that are on the zigzag line; have some characteristics of metals and some of nonmetals; semiconductors are substances that under some conditions can conduct electricity (like a metal) and other conditions cannot (like a nonmetal)
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