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5 Written questions

5 Matching questions

  1. Cathode-ray-tube
  2. Dalton's Atomic Theory
  3. Ernest Rutherford
  4. Neutron
  5. Strong Nuclear Force
  1. a a powerful force of attraction that binds protons and neutrons together in the nuleus
  2. b evacuated glass tube in which a stream of electrons emitted by a cathode strikes a fluorescent material, causing it to glow(used to discover the electron)
  3. c 1700s-1800s 1. elements are composed of tiny indivisible perticles called atoms 2. atoms of the same element are the same, and atoms of different elements are different 3. atoms can chemically combine in simple whole number ratiosto form compounds 4. chemical reactions occur when atoms are separated, joined or rearranged
  4. d from his gold foil expirments, he knew some substances give off + charged particles called alpha particles, most of the mass of an atom is in the nucleus, he reasoned that electrons in the atom are whirled around outside the nucleus, most of the atom is empty space
  5. e a subatomic particle that has no charge and that is found in the nucleus of an atom

5 Multiple choice questions

  1. The number of protons in the nucleus of an atom.
  2. a subatomic particle that has a positive charge and that is found in the nucleus of an atom
  3. a mass of an atom expressed in relation to the defined standard of 12 amu (1 carbon atom)
  4. Uses a needle-like probe to measure differences in voltage caused by electrons that leak, or tunnel, from the surface of the object being viewed
  5. negatively charged particles found outside the nucleus

5 True/False questions

  1. Molethe amount of a substance that contains as many particles as there are atoms in exactly 12 g of carbon-12


  2. Avogadro's numbernumber of representative particles in a mole, 6.02 X 10^23


  3. Gold Foil experimentnegatively charged particles found outside the nucleus


  4. James Chadwickconfirmed the existence of the neutron


  5. Plum Pudding Model of the atomatoms are balls of positively charged material with negative electrons scattered throught


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