chemistry

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Across
  1. 2. Horizontal column in periodic table
  2. 5. involving absorption of energy
  3. 6. reaction in which reactants combine
  4. 8. symbol symbol used to represent elements
  5. 9. containing two or more atoms
  6. 10. bond in which electrons are shared
  7. 13. bond in which electrons are gained or lost
  8. 14. Something in which the solute is dissolved
  9. 15. number of protons
  10. 18. positive mass in an atom
  11. 19. Components physically combined
Down
  1. 1. contains protons, electrons and neutrons
  2. 3. involving releasing of energy
  3. 4. reaction in which reactant separates
  4. 7. very reactive gases
  5. 11. molecule containing two atoms
  6. 12. vertical column in periodic table
  7. 16. pure substance that cannot be broken down.
  8. 17. Something dissolved in solvent
  9. 20. atom in which there is a charge