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5 Written questions

5 Matching questions

  1. The mass number of an atom is defined as its
  2. An atom of potassium has 19 protons and 21 neutrons. What is its mass number?
  3. The electron was descovered by
  4. Which of the following is NOT part of Dalton's Theory? In cheimcal reactions, aroms are combined, seperated, or rearranged.
    All matter is composed of extremely small particles called attoms
    Atoms cannot be divided, created or destroyed
    The number of protons in an atom is its atomic number
  5. the composition of the two oxides of lead, PbO and PbO2, are explained by the
  1. a Thomson
  2. b 40
  3. c The number of protons in an atom is its atomic number
  4. d law of multiple proportions.
  5. e total number of protons and neutrons

5 Multiple choice questions

  1. all atoms contain electrons
  2. John Dalton
  3. relative abundance
  4. amu
  5. Avogadro's number

5 True/False questions

  1. In a cathode tube, electrical current passes from on electrode, the ____, to the opositely charged electrodecathode


  2. The mass of a neutron isabout the same as that of a proton


  3. an atom is electricaly neutral becausethe number of protons and electrons are equal


  4. The atomic number of an atom is defined as itsnumber of protons


  5. Most of the volume of an ato is occupied by theelectron cloud


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