Chapter 2 biology

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Across
  1. 1. a substance that can't be broken down any further
  2. 5. the outermost shell of an atom
  3. 7. the type of bond between atoms in which valence electrons are shared
  4. 10. the starting molecules of chemical reactions
  5. 13. the weakest bond between atoms formed when they are close together
  6. 20. the sum of protons and neutrons
  7. 21. electrons that occupy the outermost shell
Down
  1. 2. a subatomic particle with a neutral charge
  2. 3. A solute that increases the H+ concentration in water
  3. 4. subatomic particle with a positive charge
  4. 6. a subatomic particle with a negative charge
  5. 8. A solute that reduces the H+ concentration in water
  6. 9. a type of covalent bond in which electrons are shared unequally due to one atom being more electronegative than another
  7. 11. a type of covalent bond in which electrons are shared equally
  8. 12. a charged atom that has lost or gained an electron
  9. 14. a number that is equivalent to the number of protons or neutrons in an element
  10. 15. the measure of how hard it is to break a surface of a liquid
  11. 16. 2 of the same elements with a differing number of neutrons
  12. 17. A week bond between a hydrogen atom covalently bonded to an electronegative atom and is attracted to another electronegative atom
  13. 18. the final molecules of a chemical reaction
  14. 19. a substance of 2 or more elements combined in a fixed ratio