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10 Cards in this Set

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matter
anything that takes up space and has mass
Physical Properties
characteristics of matter that can be observed without changing the composition of the substance
Chemical Properties
characteristics that describe how a substance interacts with other substances. (iron forming rust)
Atom
the smallest unit of an element
protons
positive electrical charge inside an atom Represented by the atomic number
atomic number
a number that tells the number of protons in an element, used to identify elements on the periodic table
molecules
The smallest complete unit of a compound
ions
an atom or group of atoms that carry an electrical charge
ionic compound
a compound formed through the transfer of electrons
alloy
a solution of two or more metals