Chemistry 104 Chapter 2 Notes
Chemistry 104 Chapter 2 Notes CH 104
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This 2 page Class Notes was uploaded by Meghan Skiba on Thursday September 15, 2016. The Class Notes belongs to CH 104 at University of Alabama - Tuscaloosa taught by Stephen Woski in Fall 2016. Since its upload, it has received 5 views.
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Date Created: 09/15/16
Chemistry Chapter 2 August 30, 2016 Atoms and The Periodic Table On exam, you will have the symbol, atomic number (number of protons) Be aware of regions: top right (nonmetals) & left (metals) & middle (metalloids) Metals: shiny solids at room temperature good conductors of heat and electricity NonMetals: dull solids, liquids, and gasses at room temperature poor conductors of heat and electricity Metalloids: properties in between metals and non metals Elements in Humans Major Minerals: (K, Na, Cl bodily fluids), (Mg, Smuscles), (Ca, Pteeth bones) Compounds formed by chemically combining two or more atoms a chemical formula shows elements present and how many of each element are presend in a molecule (H O2 ex: Al2(SO 4 3 Al 2S 3 12 Structure of The Atom Nucleus location of protons (+) and neutrons (0) dense core of the atom location of most of the atom’s mass Electron Cloud location of electrons () comprises most of the atom’s volume (opposites attract) Elements on the Periodic Table Atomic Number (number of protons) Element Symbol Atomic Weight (amu) Mass number is above element symbol Atomic number is below element symbol Isotopes: same element with same number of protons – atomic number, but different number of neutrons – mass number (number of protons and neutrons will always add up to mass number) (protons remain unique to element) Elements in same columns groups (up and down) have similar properties Elements in same rows – periods (across) are not as similarly grouped Know alkali metals (1A), alkaline earth metals (2A), halogens (7A), and noble gasses (8A)
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