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5 Written questions

5 Matching questions

  1. Scanning Tunneling Microscopes(STM)
  2. Atom
  3. J J Thompson
  4. Electrons
  5. Ernest Rutherford
  1. a negatively charged particles found outside the nucleus
  2. b 1897- Idea of a subatomic negatively charged particle (electron). Made Plum Pudding model of the atom.
  3. c from his gold foil expirments, he knew some substances give off + charged particles called alpha particles, most of the mass of an atom is in the nucleus, he reasoned that electrons in the atom are whirled around outside the nucleus, most of the atom is empty space
  4. d the smallest particle of an element that retains its identity in a chemical reaction
  5. e Uses a needle-like probe to measure differences in voltage caused by electrons that leak, or tunnel, from the surface of the object being viewed

5 Multiple choice questions

  1. the weighted average of the atomic masses of the naturally occurring isotopes of an element
  2. a subatomic particle that has no charge and that is found in the nucleus of an atom
  3. The number of protons in the nucleus of an atom.
  4. the sum of the numbers of protons and neutrons in the nucleus of an atom
  5. the amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12

5 True/False questions

  1. Nucleusthe amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12

          

  2. Law of Definite Proportionsif two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers

          

  3. Relative Atomic Massthe weighted average of the atomic masses of the naturally occurring isotopes of an element

          

  4. Avogadro's numbernumber of representative particles in a mole, 6.02 X 10^23

          

  5. Law of Multiple Proportionsif two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers

          

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