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Chemistry - Chapter 4

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