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Name: _______________________ Chem. Notes Date: __________ /HW#: ____ Mr. Jensen/Period: _____ Let’s talk chemistry! 1. The atom Basic unit of _________________________ Made up of __________________, ___________________ and _______________ The whole atom is _____________________ charged (no charge) Fill-in the following: Helium Atom: Atomic Number 2 Number of protons: _____ Number of Electrons: _____ Number of Neutrons: 2 Now draw the atom in the box below and label the protons, neutrons and electrons. 2. Structure of an atom The nucleus of an atom: Protons are _________________________ charged Neutrons have ______ charge Electrons: in constant _________________ around nucleus _______________________ charged Atoms have an equal number of _________________ and _________________. 3. Elements _________________ substance Made of ___________ type of atom Represented by _____, _____ or _____ letters 4. History of the Periodic Table ______________________ (watch your spelling!) designed the first periodic table He arranged the elements by ________________________ atomic mass He left ________________ spaces according to similarities in columns of elements Mendeleev’s __________________ spaces (or predictions) were elements that he claimed were not __________________________ yet. As it turns out, he was right!! Scientists later ______________________ the missing elements with the properties that Mendeleev predicted! And even more history! Moseley discovered the ____________________ number He organized the periodic table by increasing _________________ number This allowed for elements with similar _______________________ to fall into place An gave way to the _____________________ periodic table 5. Molecules Smallest unit (part) of a compound In the box, draw and label the elements in a water molecule (H2O) 6. Compounds a substance that contains ______________ or more different elements organic compounds must contain ________________________ Acetic acid (vinegar) is an example 7. Molecular formula Shows how many _________________ of each element a molecule contains Does not tell you about a molecule’s __________________________ Examples of molecular formulas – fill in the number of each atom for each of the following formulas. H2O Hydrogen atoms __________ Oxygen atoms _________ NH3 Nitrogen __________ Hydrogen __________ C6H12O6 Carbon ___________ Hydrogen __________ Oxygen ___________ 8. Structural formula Shows how atoms are _______________________ in a molecule 2-dimensional representation of a molecule’s ______________________ Label each of the following molecules with their name and molecular formula Name: ________________ Name: ________________ Name: ________________ Formula: ______________ Formula: _____________ Formula: ______________ 9. 3-D Models Shows how the __________________ are _________________________in a molecule Is able to be _______________ or _______________________, allowing you to view the molecule from ___________________________ _________________________.