Structures and Changes Vocabulary

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Across
  1. 3. the # of protons and neutrons in the nucleus
  2. 4. a substance that is made up of only one kind of atom
  3. 6. horizontal rows on the periodic table that are organized by atomic #
  4. 8. a characteristic that enables a substance to undergo a chemical change. Ex: flammability
  5. 10. when more than one atom chemically combines
  6. 11. first to discover atoms
  7. 12. greek word means indivisible
  8. 13. a characteristic that can be observed or measured. Ex: texture
  9. 15. materials that are needed to start the chemical reaction
  10. 18. smallest unit of an element
  11. 19. neutral and in the nucleus
  12. 20. when two or more substances chemically combine and form a new substance
  13. 21. vertical columns on the periodic table that are organized by similar properties
Down
  1. 1. positive and is in the nucleus
  2. 2. the amount of matter in a chemical reaction does not change, so the total mass of the reactants must equal the total mass of the products
  3. 5. negative and goes around the nucleus
  4. 7. new substances that are made during the reaction
  5. 9. the process of one or more substances converting to form new substances with different properties
  6. 14. a substance that is made of two or more elements chemically combined. Can only be broken apart by chemical reaction
  7. 16. center of an atom that contains protons and neutrons
  8. 17. alters the form of a substance but does not change it into a new substance with new properties