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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. An atom of potassium has 19 protons and 21 neutrons. What is its mass number?
  3. The mass number of an atom is defined as its
  4. Which part of an atom has a mass approximately equal to 1/2000 of the mass of a common hydrogen atom?
  5. According to Dalton's atomic theory, atoms
  1. a total number of protons and neutrons
  2. b of each element are identical in size, mass, and other properties
  3. c nucleus
  4. d 40
  5. e Avogadro's number

5 Multiple choice questions

  1. 27
  2. electron
  3. Thomson
  4. masses
  5. all atoms contain electrons

5 True/False questions

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


  2. In a cathode tube, electrical current passes from on electrode, the ____, to the opositely charged electrodepassed through the foil


  3. As the atomic number increases, the number of electrons in an atomnumber of protons


  4. After measuing the ratio of the charge of a cathode ray particle to its mass, Thomson concluded that the particleselectron


  5. The mass of a neutron isThomson


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