Water and Life

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Across
  1. 2. weak attraction between a hydrogen atom and another atom
  2. 4. negatively charged particle
  3. 7. Basic unit of matter
  4. 8. a thing that is composed of two or more separate elements; a mixture.
  5. 9. A chemical bond resulting from the attraction between oppositely charged ions.
  6. 11. Attraction between molecules of the same substance
  7. 12. A pure substance made of only one kind of atom
  8. 13. A chemical bond formed when two atoms share electrons
Down
  1. 1. A measure of how difficult it is to stretch or break the surface of a liquid
  2. 3. Atoms of the same element that have different numbers of neutrons
  3. 5. A charged atom
  4. 6. Center of an atom
  5. 7. An attraction between molecules of different substances
  6. 10. A group of atoms bonded together