7 notecards = 2 pages (4 cards per page)
What is an element?
Unique substances that cannot be broken down into simpler substances by ordinary chemical bonds.
What determines the unique properties of an element?
Atoms of different elements are composed pf different numbers of protons, neutrons, and electrons.
What is an isotope?
Different atomic forms of the same element, which vary only in the number of neutrons they have.
Isotope that exhibits radioactive behavior
What is a molecule?
The combination of two or more atoms held together by chemical bonds.
What is a compound?
Two or more different kinds of atoms bind together. Example H2O.
What is a mixture?
Two or more components physically intermixed.