Chemistry Crossword

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Across
  1. 3. - dull, brittle element that does not conduct electricity
  2. 6. - group 17 elements in the periodic table; the most reactive non-metals
  3. 8. - the smallest part of an element that is representative of that element; a neutral particle made up of a nucleus containing protons and neutrons, and in which the number of electrons equals the number of protons
  4. 10. - atom that has become electrically charged because it has lost or gained electrons; a positive ion is an atom that has lost one or more electrons; a negative ion is an atom that has gained one or more electrons
  5. 11. - description of a substance that can be pounded or rolled into sheets
  6. 12. - group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals
  7. 15. - anything that has mass and occupies space
  8. 16. - substance that helps a chemical reaction to proceed more quickly
  9. 18. - invisible negatively charged particle that orbits the nucleus of an atom
  10. 19. - neutral particle in the nucleus of an atom
  11. 20. - mass of one atom of an element calculated from the total number of protons, neutrons, and electrons of that atom; measured in atomic mass units (amu)
  12. 22. - substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
  13. 23. - change of state from a liquid to a solid
Down
  1. 1. - pure substance that cannot be broken down into other substances; substance made up of only one type of atom
  2. 2. - shiny , malleable, ductile element that conducts electricity
  3. 4. - number of protons in the nucleus of one atom of an element
  4. 5. - property that describes the physical appearance and composition of a substance
  5. 6. - metals that have a density of 5 or higher heavy metals are one type of substance monitored to determine water quality
  6. 7. - group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals
  7. 9. - substance that strongly resists the flow of electricity
  8. 11. - the sum of the number of protons and neutrons in an atom
  9. 13. - group 18 elements in the periodic table; the most stable and unreactive elements
  10. 14. - change of state from a gas to a solid
  11. 17. - positively charged centre of an atom; contains protons and neutrons
  12. 21. - chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy