Chem Chap 2 - Atoms Molecules simplest unit of compound AMU...

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Atoms Molecules: simplest unit of compound AMU: 1/12 mass of Carbon-12 Ion: unequal protons and electrons. Cation=positive Anion=negative Isotope: different neutrons Z-number/Atomic #: protons Mass number: protons and neutrons Atomic weight: average mass of all naturally occurring isotopes Percent abundance: percent of each isotope Periodic Table Dmitri Mendeleev argued table was function of atomic weights Vertical columns are groups(18) and Horizontal rows are periods(7) Main group elements are A group Transition Metals are B group. Most occur in natural compounds except copper, silver, gold, platnium Lanthanides and actinides periods 6/7 Metals: left, shiny/solid/ductile/conductors Non-metals: right/brittle/solid/some gases/insulators Metalloids: semi-metals 1A(not Hydrogen): Alkali-solid at room temp. Reacts with water air and halogens and always found in compounds 2A: Alkaline-Earth- found in compounds and found in water alkaline solutions 3A:All metals except Boron(metalloid). Aluminium most abundant metal in crust only exceeded by
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