Chemistry Crosswords

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Across
  1. 5. chemical combination of two or more elements in a specific ratio
  2. 8. slow chemical change that occurs when oxygen in the air reacts with a metal
  3. 10. group 2 elements in the periodic table; their reactivity is not as strong as that of the alkali metals
  4. 14. invisible negatively charged particle that orbits the nucleus of an atom
  5. 16. chemical reaction that releases energy
  6. 18. pure substance formed when at least one metal and one non-metal combine
  7. 20. group 1 elements in the periodic table, not including hydrogen; the most reactive of the metals
  8. 21. of energy fundamental principle that energy cannot be created or destroyed
  9. 23. positively charged centre of an atom;contains protons and neutrons
  10. 24. number of protons in the nucleus of one atom of an element
  11. 25. group 17 elements in the periodic table; the most reactive non-metals
Down
  1. 1. new substance produced in a chemical reaction between reactants
  2. 2. 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
  3. 3. 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)
  4. 4. mogeneous mixture; mixture of two or more pure substances that looks like one substance
  5. 6. change of state from a solid to a gas or from a gas to a solid
  6. 7. positively charged particle in the nucleus of an atom
  7. 9. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
  8. 11. chemical reaction that absorbs energy
  9. 12. pure substance that cannot be broken down into other substances; substance made up of only one type of atom
  10. 13. table in which the elements are organized by their physical and chemical properties
  11. 15. pure substance formed when non-metals combine
  12. 17. group 18 elements in the periodic table;the most stable and unreactive elements
  13. 19. orbit of electrons around the nucleus of an atom
  14. 22. 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