atom - building blocks of matter, subatomic particles - protons, electrons, neutrons, protons - POSITIVELY charged and found in the nuclues, electrons - NEGATIVELY charged and found ORBITTING the nucleus in shells , neutrons - NO charge and found in the nucleus, electronic configuration - this shows how the electrons are arranged in shells, atomic model - a simple visual representation of the atom , periodic table - A table of of the known elements , groups - Vertical columns in the periodic table , periods - Horizontal rows in the periodic table (goes across) , 1st shell - 2 electrons only , 2nd shell - 8 electrons only , 3rd shell - up to 18 electrons, atomic number - tells you how many protons (and electrons) the atoms has, mass number - is made up of protons and neutrons, chemical symbol - Every element has a unqiue letter or 2 letters that represent the individual element,

Atomic Structure

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