SPS Unit 3: Chemical Bonding, Reactions and Energy

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lewis dot structure

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diagram of a molecule using dots to represent valence electrons

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valence electrons

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Electrons on the outermost energy level of an atom

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ionic bonds

Back

Formed when one or more electrons are transferred from one atom to another

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covalent bond

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A chemical bond formed when two atoms share electrons

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metallic bond

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an attraction between a positive metal ion and the electrons surrounding it

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ion

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A charged atom

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cation

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A positively charged ion

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anion

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A negatively charged ion

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Physical Change

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A change in a substance that does not change its identity

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Chemical reaction (change)

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A change in matter that produces one or more new substances