The nature of matter

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Across
  1. 3. pure substance that consists entirely of one type of atom
  2. 5. negatively charged particle; located in the space surrounding the nucleus
  3. 8. in cells, structure that contains the cell's genetic material in the form of DNA
  4. 11. substance formed by the chemical combination of two or more elements in definite proportions
Down
  1. 1. one of several forms of a single element, Which contains the same number of protons but different numbers of neutrons
  2. 2. slight attraction that develops between oppositely charged regions of nearby molecules
  3. 4. atom that has a positve or negative charge
  4. 6. between atoms in which the electrons are shared
  5. 7. the smallest unit of most compounds that displays all the properties of that compound
  6. 9. basic unit of matter
  7. 10. chemical bond form when one or more electrons are transferred from one to another