Science assignment

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Across
  1. 2. Number of protons in the nucleus of one atom of an element
  2. 4. dull, brittle element that does not conduct electricity
  3. 5. A table in which the elements are organized by their physical and chemical properties
  4. 7. Element that has both metallic and non-metallic properties
  5. 8. Change that results when two or more substances react to create a different substance or substances
  6. 9. Group 17 elements in the periodic table, the most reactive non-metals
  7. 11. Mass of one atom of an element calculated from the total number of protons neutrons and electrons of that atom
  8. 12. A reaction that takes place when two or more substances react to from a new substance
  9. 17. An experiment in which all reactants and all products of a chemical reaction are accounted for
  10. 18. Substance that reacts with another substance or substances in a chemical reaction to create new substances with other substances
  11. 19. Catalyst involved in chemical reactions in living things
  12. 20. Positively charged center of an atom that contains protons and neutrons
  13. 21. Group 18 elements in the periodic table of elements that is most stable and unreactive elements
  14. 22. Slow chemical change occurs when oxygen in the air reacts with metal
  15. 23. Chemical combination of two or more elements in a specific ratio
  16. 24. shiny, malleable, ductile, elements that conduct electricity
Down
  1. 1. Pure substance that cannot be broken down into other substances
  2. 3. Principle that matter is not created or destroyed in a chemical reaction
  3. 6. Chemical reaction that releases energy
  4. 10. A chemical reaction that absorbs energy
  5. 13. invisible negatively charged particle that orbits the nucleus o an atom
  6. 14. An experiment in which one or more products of a chemical reaction can escape
  7. 15. substance that helps a chemical reaction to proceed more quickly
  8. 16. Atom that has become electrically charged because it has lost or gained electrons
  9. 17. Chemical reation that occurs when oxygen reacts with a substance to from an new substance and give off energy
  10. 21. A neutral substance is neither an acid nor a base