Chem Final Crossword

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Across
  1. 3. 1s2 2s2 2p3
  2. 6. Hg
  3. 8. A substance that conducts electricity when dissolved in water
  4. 9. replacement reaction A reaction that involves an exchange of positive ions between two compounds
  5. 11. A whole number that appears before a formula in an equation
  6. 12. table A table of chemical elements arranged in order of atomic number
  7. 15. bonding When a pair of electrons is shared between two atoms
  8. 16. Ba
  9. 17. Positively charged ions formed when electrons are lost
  10. 20. 2 atoms of hydrogen and one oxygen
  11. 21. dot structure Name of structure of dna
Down
  1. 1. reaction A reaction in which oxygen reacts with another substance, often producing carbon dioxide and water
  2. 2. bonds Bonds form to make atoms happy, allow atoms to follow the octet rule, and hold atoms together
  3. 4. Indicates a substance is dissolved in water
  4. 5. reaction A reaction in which a single compound is broken down into simpler substances
  5. 7. ion Nitrate ion (NO3-)
  6. 10. A starting substance in a chemical reaction
  7. 12. A new substance formed in a chemical reaction
  8. 13. 1s2 2s2 2p6 3s2 3p5
  9. 14. bonding Atoms give away or accept electrons
  10. 18. Negatively charged ions formed when electrons are gained
  11. 19. replacement reaction A reaction in which the atoms of one element replace the atoms of a second element
  12. 22. Atoms or groups of atoms with a charge ( negative or positive)