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Atoms

Name ______________________________
Across
Smallest unit of any substance
small piece of matter that is part of an atom
Mass of an atom
Number of protons in a nucleus
A particle that is negatively charged
central part of an atom
Down
Composed of two or more elements
The scientific theory of the nature of matter.
A particle that is positively charged
smallest part of an element. consists of two or more atoms.
A particle that has no electrical charge