Science Term 2

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Across
  1. 1. atoms that change over time
  2. 5. the scale used to compare the electronegativity of atoms
  3. 6. pure substances made from a single type of atom
  4. 7. a column on the periodic table
  5. 8. an atom or molecule's ability to attract electrons
  6. 13. when a single compound breaks down into 2 or more smaller products
  7. 14. an exothermic chemical reaction
  8. 18. the central zone of atoms
  9. 19. a bunch of atoms bonded together
  10. 21. electrons in the outer shell of an atom
  11. 22. subatomic particles with a positive charge
Down
  1. 2. the arrangement of electrons in the shell
  2. 3. when 2 or more substances combine
  3. 4. a molecule containing over 2 types of atoms
  4. 5. scale measures acids and bases
  5. 6. subatomic particles with a negative charge
  6. 9. when elements/compounds rearrange themselves in an equation
  7. 10. occur when the nucleus loses or gains a neutron
  8. 11. is neutralised by bases
  9. 12. the founder of modern atomic theory
  10. 15. chemicals that change colour when added to an acid or base
  11. 16. the most electronegative element on the Pauling Scale
  12. 17. a row on the periodic table
  13. 18. subatomic particles with no charge
  14. 20. chemical particle that retains the particle's properties