Biology

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Across
  1. 2. chemical substance composed of many identical molecules
  2. 3. the action or process of adhering to a surface or object.
  3. 4. a stable subatomic particle occurring in all atomic nuclei,
  4. 6. he action or fact of forming a united whole
  5. 9. a stable subatomic particle with a charge of negative electricity
  6. 12. an atom or molecule with a net electrical charge.
  7. 13. chemical substance that cannot be broken down into other substances.
  8. 14. type of chemical bond that is formed when electrons are shared equally between two atoms.
  9. 15. a subatomic particle of about the same mass as a proton but without an electric charge
Down
  1. 1. a molecule in which one end of the molecule is slightly positive, while the other end is slightly negative.
  2. 5. the basic unit of a chemical element.
  3. 7. exists when atoms with different electronegativities share electrons in a covalent bond.
  4. 8. distinct nuclear species of the same chemical element.
  5. 10. the interatomic linkage that results from the sharing of an electron pair between two atoms.
  6. 11. between two atoms with sharply different