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5 Written Questions

5 Matching Questions

  1. The number of atoms in a mole of any pure substance is called
  2. The electron was descovered by
  3. an atom is electricaly neutral because
  4. as the atomic masses of the elements in the periodic table increase, th number of atoms in a mole of each element
  5. What did Rutherford conclude about the structure of the atom
  1. a An atom contains a small, dense, positively charged central region
  2. b the number of protons and electrons are equal
  3. c Avogadro's number
  4. d Thomson
  5. e remains the same

5 Multiple Choice Questions

  1. number of protons
  2. number of protons
  3. cathode
  4. tightly packed protons and neutrons
  5. 9 protons and 10 neutrons

5 True/False Questions

  1. After measuing the ratio of the charge of a cathode ray particle to its mass, Thomson concluded that the particleshad a very small mass


  2. the composition of the two oxides of lead, PbO and PbO2, are explained by theelectron cloud


  3. A nuclear particle taht has about the same mass as a proton but with no electrical charge is called a(n)retains the chemicl identity of that element


  4. An atom is defined as the smallest part of an element thatthe number of protons and electrons are equal


  5. The average atomic mass of an element depends on both the masses of its isotopes and each isotope'srelative abundance


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