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THE STRUCTURE OF MATTER CROSSWORD PUZZLE

Across
A subatomic particle with a positive electric charge (+)
A particle smaller than an atom with or w/o a positive or negative charge
These 2 are located in the nucleus of an atom
A subatomic particle with a positive electric charge (+)
Down
A theory that involves with the particles of an atom
A subatomic particle with a negative electric charge (-)
Basic unit of a chemical reaction
A Physical structure that occupies space and possess rest mass