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Atoms, Ions, and Isotopes 9/9/2015 Quick Review • Atoms are made up of three particles: • Protons • Neutrons • Electrons • Question: Which of the three particles identifies what element an atom is? • The PROTON! (very important) Different Forms of the Same Element • In any element, the # of protons is always constant. • the # of electrons and neutrons can change in an element without changing the identity of the element. Isotopes • An ISOTOPE is a form of an element that has a different number of neutrons than “normal” • Carbon has three isotopes Notice how the # of protons does NOT change! IONS • An atom usually has a neutral charge. That means it has the same number of protons as electrons • Remember, a proton has a positive charge and an electron has a negative charge • ION – an atom that has lost or gained one or more electrons and has become charged either positively or negatively Atomic Cards Activity • Spread out the 18 models of atoms • Match each model with the element location of the Periodic table. • Look for patterns vertically and horizontally. • Once done go to google classroom and complete Atomic Card Questions and turn in