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Name ___________________________________________ Date ___________________ Period __________ NOTES: The Atom - Fill in the blanks as you go over the notes in class. Definition: Atom The smallest ___________________ into which an __________________ can be divided and still maintain the ___________________ of that element. Atomic Theory: All _____________________ is composed of atoms. The atomic theory describes the __________________, __________________ and other properties of the atom and its component ___________________. Atoms are made up of even smaller particles called: 1. __________________________ 2. __________________________ 3. __________________________ Protons: ______________________ charged Located in the _________________ of the atom All protons are ___________________ Neutrons: Neutrons have no __________________________________, they are ______________________ Also located in the ____________________ of the atom All neutrons are ________________________ Electrons: ________________________ charged Located ________________________ the nucleus of the atom All electrons are ________________________ The number and arrangement of the electrons in an atom determine its ____________________________ Electrons travel in random paths in areas around the nucleus called _______________________________ Atomic Structure: __________________ and __________________ stick together to form the atom’s _________________. Electrons are found in the _________________ surrounding the _____________________. Protons and electrons are __________________ in charge but __________________ in sign. Since unlike charges ________________ each other, electrons and protons exert an attractive electrical force on each other. That’s what holds __________________ to the ___________________. Atoms and Elements: Different kinds of atoms are called ________________. An atom is identified by the number of ___________________ in its nucleus o Example: an atom of Hydrogen has ______ proton, an atom of Oxygen has ______ protons o All atoms of the same __________________ have the _________________ number of protons Each atom has the same number of protons as _____________________ because there must be an equal number of positive and negative charges—the atom is always _____________________. o Example: If an atom has 12 protons, how many electrons does it have? _________ Molecules or Compounds: When two or more atoms combine, they form a ________________ also known as a ________________. Most ___________________ are made out of _________ or more atoms of ________________ kinds (different elements). o For example, a _____________ molecule (H2O) is made of two ______________ atoms (H) and one _________________ atom (O) o Each molecule of water behaves like _______________. If the molecules are _______________ into separate _______________ and ________________ atoms, however, the particles no longer ______________ like water. Wrap It Up: Atomic Particles Particle Proton Neutron Electron Relative Mass Charge Location in Atom