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5 Written questions

5 Matching questions

  1. The average atomic mass of an element depends on both the masses of its isotopes and each isotope's
  2. The nucleus of most atoms is composed of
  3. In the gold foil experiment, most of the particles fired at the foil
  4. Who first propsed an atomic theory based on scientific knoledge
  5. The number of atoms in a mole of any pure substance is called
  1. a John Dalton
  2. b passed through the foil
  3. c Avogadro's number
  4. d tightly packed protons and neutrons
  5. e relative abundance

5 Multiple choice questions

  1. 27
  2. electron
  3. masses
  4. number of protons
  5. remains the same

5 True/False questions

  1. The atomic number of an atom is defined as itstotal number of protons and neutrons


  2. Because any element used in the cathode produced electrons, scientist concluded thatelectron


  3. The mass of a neutron isThomson


  4. Which part of an atom has a mass approximately equal to 1/2000 of the mass of a common hydrogen atom?nucleus


  5. The symbol ^19F indicates a fluorine atom that contains9 protons and 10 neutrons