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5 Written questions

5 Matching questions

  1. energy level
  2. mass number
  3. van der Waals interaction
  4. molecule
  5. radioactive isotope
  1. a two or more atoms held together by covalent bonds
  2. b different states of potential energy for electrons in an atom
  3. c one in which the nucleus decays spontaneously, giving off particles and energy
  4. d weak and occur only when atoms and molecules are very close together
  5. e sum of protons plus neutrons in nucleus

5 Multiple choice questions

  1. charged atom
  2. energy that matter stores because of its position or location
  3. those required by an organism in only minute quantities
  4. substance consisting of two or more elements combined in a fixed ratio
  5. holds atoms together, strongest are covalent and ionic bonds

5 True/False questions

  1. hydrogen bondsharing of a pair of valence electrons by two atoms


  2. atomic weightmass of an atom


  3. valence shellbonding capacity, equals number of unpaired electrons in the atom's outermost shell


  4. isotopeatoms that have more neutrons than other atoms of the same element and therefore weigh more


  5. valence electronouter electrons


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