Physical science review

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Across
  1. 3. when a two different substances are attracted to each other
  2. 4. when a solution has more hydroxide ions
  3. 6. when two atoms share electrons evenly
  4. 9. has a charge of 2 and mass of 4
  5. 11. a single sheet of this can stop alpha particles
  6. 18. when a solution has equal amounts of hydrogen and hydroxide ions
  7. 19. an atom ability to attract electrons
  8. 20. an arrow that points to the atom with the most electronegative atom
Down
  1. 1. a special type of bond that allows ice to float
  2. 2. same number of protons different number of neutrons
  3. 5. water is considered this in terms of solvents
  4. 7. a type of decay where an atom breaks apart
  5. 8. a particle energy only
  6. 10. the amount of time it takes for half the original material to break apart into something else
  7. 12. when a molecule is more attracted to same molecules
  8. 13. outer most electrons
  9. 14. has charge of -1 and mass of 0
  10. 15. when a solution has more hydrogen ions
  11. 16. when two atoms share electrons unevenly
  12. 17. the substance that can stop gamma radiation