Chemistry crossword-Andrea M. 9-H

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Across
  1. 2. vertical column of elements in the periodic table
  2. 5. a group 18 elements in the periodic table
  3. 7. when an element absorbs heat
  4. 8. atom that has become electrically charged because it has lost or gained electrons
  5. 10. number of protons in the nucleus of one atom of an element
  6. 12. element that has both metallic and nonmetallic properties
  7. 17. dull, brittle element that does not conduct electricity
  8. 20. group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals
  9. 22. pure substance that can't be broken down into other substances
  10. 23. chemical combination of two or more elements
  11. 25. pure substance formed when at least one metal and one non-metal combine
Down
  1. 1. ability of a substance to conduct electricity or heat
  2. 3. a system of warning symbols on hazardous materials
  3. 4. a table in which the elements are organized by their physical and chemical properties
  4. 6. change that results when two or more substances react to create a different substance or substances
  5. 9. mass of one atom of an element
  6. 11. pure substance formed when at least two non-metals combine
  7. 13. a material that electric charge can move through easily
  8. 14. chemistry) vertical column of elements in the periodic table
  9. 15. a reaction that takes place when two or more substances react to form new substances
  10. 16. anything that has mass and occupies space
  11. 18. the smallest part of an element
  12. 19. neutral particle in the nucleus of an atom
  13. 21. when an element gives of heat
  14. 24. positively charged centre of an atom; contains protons and neutrons