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Atom The smallest particle into which an element can be divided and still be the same substance http://farm5.staticflickr.com/4006/4395962564_84d71bbc66.jpg Electron The negatively charged particles found in all atoms http://farm4.staticflickr.com/3201/2821103686_2e73dceffd.jpg Nucleus The tiny, extremely dense, positively charged region in the center of an atom http://farm4.staticflickr.com/3648/3439720536_ec8c4e5085.jpg Electron clouds the regions inside an atom where electrons are likely to be found http://farm4.staticflickr.com/3590/3406262383_c6a214c56a.jpg Protons The positively charged particles of the nucleus http://farm3.staticflickr.com/2743/4423382096_02368f448e.jpg Neutrons The particles of the nucleus that have no charge http://farm3.staticflickr.com/2768/4433055954_a5498e0521.jpg Atomic number The number of protons in the nucleus of an atom. http://o.quizlet.com/i/O0SEvxIT0B-Src_vkdgJgw.jpg Protons and Electrons A neutral atom has an equal number of ________ and ________. http://o.quizlet.com/i/O0SEvxIT0B-Src_vkdgJgw.jpg Periods The horizontal rows of elements in the periodic table http://o.quizlet.com/i/Tcb-3GTnN6mnNxoPBYxLSw.jpg Groups or Family Vertical columns on periodic table http://o.quizlet.com/i/PbPT1aDAAhkys7f3zI4Twg.jpg Theory A unifying explanation for a broad range of hypotheses and observations that have been supported by testing http://farm2.staticflickr.com/1101/631503428_add1554412.jpg Model A representation of an object or system Isotopes Atoms that have the same number of protons but have different numbers of neutrons http://farm1.staticflickr.com/1/108845_272ee0c8bf.jpg Mass number, Atomic Mass Unit ,AMU or Atomic Weight The sum of the protons and neutrons in an atom http://farm1.staticflickr.com/57/176057818_8eae5487b2.jpg PERIODIC TABLE OF ELEMENTS A CHART THAT ORGANIZES ALL KNOWN ELEMENTS INTO A GRID OF HORIZONTAL ROWS (PERIODS) AND VERTICAL COLUMNS (GROUPS OR FAMILIES) ARRANGED BY INCREASING ATOMIC NUMBER http://farm4.staticflickr.com/3576/3354353558_b882b31fe1.jpg Elements A pure substance that is made up of only one kind of atom http://farm5.staticflickr.com/4154/4948698300_31d79f3bee.jpg Dmitri Mendeleev Created the first periodic table, arranged elements by increasing atomic mass http://farm3.staticflickr.com/2233/2453098841_ce08e88e05.jpg Chemistry The study of matter and the changes that it undergoes http://farm3.staticflickr.com/2777/4273968004_4a7b1490c0.jpg Subatomic Particles Particles found within the atom, mainly protons, neutrons, and electrons. http://farm3.staticflickr.com/2743/4423382096_02368f448e.jpg Chemical Symbol A one or two letter representation of an element http://farm4.staticflickr.com/3189/2373791325_463ffd1510.jpg