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Atomic Theory

TermDefinition
Matter anything that has mass and takes up space. ALL solids, liquids, & gases
Atom The smallest particle that has the characteristics of that element
Subatomic Particles The smaller parts that make an atom - Protons, neutrons, & electrons
Proton Positive charge, found in the nucleus, 1 AMU
Neutron Neutral charge, found in the nucleus, 1 AMU
Electron Negative charge, found in the electron cloud, .0005 AMU
Element A substance that cannot be broken down into any other substance by physical or chemical means. It is made of ONLY one type of atom.
Periodic Table An arrangement of the elements showing the repeating pattern of their properties.
Atomic Number The number of protons in the nucleus The number of electrons in the electron cloud
Atomic Mass The average mass of an atom number of protons + number of neutrons
Period Horizontal rows Each row has a new electron shell
Groups/Families Vertical rows Elements that share similar characteristics
Created by: Stszerdy