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5 Written Questions

5 Matching Questions

  1. An atom of potassium has 19 protons and 21 neutrons. What is its mass number?
  2. The mass of a neutron is
  3. 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
  4. An atom's density is based upon its
  5. In a cathode tube, electrical current passes from on electrode, the ____, to the opositely charged electrode
  1. a The number of protons in an atom is its atomic number
  2. b number of protons
  3. c about the same as that of a proton
  4. d 40
  5. e cathode

5 Multiple Choice Questions

  1. electron cloud
  2. increases
  3. electron
  4. neutron
  5. retains the chemicl identity of that element

5 True/False Questions

  1. An isotope has 30 protons, 36 neutrons, and 30 electrons. How many protons are in the nucleus?30


  2. The nucleus of most atoms is composed ofThomson


  3. Isotopes are atoms of the same element that have differentneutrons


  4. The number of atoms in a mole of any pure substance is calledAvogadro's number


  5. as the atomic masses of the elements in the periodic table increase, th number of atoms in a mole of each elementremains the same


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