Shai Oliva

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