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electron negative charge
proton positive charge
neutron no charge
electron cloud outside of nucleus, holds electrons
ionic bond electrons are gained or lost
covalent bond electrons are shared
creator of periodic table Dimitri Mendeleev
elements are arranged by there properties
there are just over _______ known elements 100
physical changes a change in physical properties
chemical changes produces a new substance with new properties
chemical properties how a substance reacts with other substances
physical properties observed with senses ex. color, size, shape, etc.
separating mixtures by hand, filtering, evaporation, heating/pressure, chromatography
compounds atoms or more than one element joined together
mixture atoms not joined together, just mixed
solution dissolved particles, hard to separate
molecule a type of compound with two or more atoms joined together. Smallest part a compound can be broken into.
acid sour taste, 0-7 on pH scale, conduct electricity, react with metals
base bitter taste, feels slippery, 7-14 on pH scale
Created by: kgreco