concept 2.1: matter consists of chemical elements in pure form and in combinations called compounds
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13 Terms
define matter
makes up anything that takes up space and has mass
element
a substance that cannot be broken down to other substances by chemical reactions
compound
a substance consisting of two or more elements in a fixed ratio
what are the 4 most important elements of life
carbon, oxygen, hydrogen , nitrogen
charge of neutrons, protons, and electrons
neutrons- no charge
protons- positive charge
electrons- negative charge
isotope
two atoms of an element that differ in the number of neutrons
redioactive tracers
radioactive isotopes often used as diagnostic tools in medicine
radiometric dating
a "parent" isotope decays into its "daughter" isotope at a fixed rate, expressed as the half-life of the isotope
define energy
the capacity to cause change
the lower the shell for an electron results in what
lower potential energy of electrons
what does it mean for an element to have a full valence
the element is non reactive
how many electrons can occupy a single orbital
no more than two
define potential energy
the energy that matter possesses because of its location or structure
Note 
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