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Chemistry - Chapter 4

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Across
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Electrons fill orbitals starting with the lowest-energy ones and then filling higher-energy orbitals as needed.
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Breaking down a chemical using electricity
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The concept that light as well as many subatomic particles have the properties of both particles and waves.
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An atom or group of atoms that develop an electrical charge by gaining or losing electrons.
Down
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An atom's outermost electrons.
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A compound formed by cations and anions held together by their mutual attraction.
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Chemicals that form a conductive solution when dissolved.