Unit 6 Criss-Cross PuzzleFill in the puzzle based on the clues listed below the puzzle.
Across 4. sticking or holding together to form a whole 5. a single atom or group of atoms that have either a positive or negative charge 6. the spreading of one substance into another substance
Down 1. an element that has different numbers of neutrons 2. a consistent set of related scientific ideas 3. the attraction between particles (atoms, ions, or molecules)
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