Which particle-level diagram is the best representation for a 
atom? 
Definitions:
Reaction
A chemical change that occurs when substances combine or decompose forming new compounds.
Boiling Point
The temperature at which a liquid’s vapor pressure equals the external pressure surrounding the liquid, causing it to turn into vapor.
Molecules
The smallest unit of a chemical compound that can exist, composed of two or more atoms bonded together chemically.
Compound Name
The designation of a chemical substance based on its composition and structure.
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