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5 Written Questions

5 Matching Questions

  1. Mass number
  2. Law of Definite Proportions
  3. Avogadro's number
  4. Atomic Number
  5. Atom
  1. a the sum of the numbers of protons and neutrons in the nucleus of an atom
  2. b the fact that a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound
  3. c number of representative particles in a mole, 6.02 X 10^23
  4. d the smallest particle of an element that retains its identity in a chemical reaction
  5. e The number of protons in the nucleus of an atom.

5 Multiple Choice Questions

  1. negatively charged particles found outside the nucleus
  2. atom of an element that has a number of neutrons different from that of other atoms of the same element
  3. the mass in grams of 1 mol of a substance
  4. Conducted by Ernest Rutherford in which alpha particles that were shot at gold foil were deflected when they hit the positive center of gold atoms. The nucleus was discovered as a result of this experiment.
  5. a powerful force of attraction that binds protons and neutrons together in the nuleus

5 True/False Questions

  1. Neutrona subatomic particle that has no charge and that is found in the nucleus of an atom


  2. Plum Pudding Model of the atomcreated by Ernest Rutherford. Replaced the Plum Pudding Model. Atom is like a miniature solar system with the positive particles in the middle and the negative particles orbiting as the planets do around the center.


  3. Law of Conservation of Massthe weighted average of the atomic masses of the naturally occurring isotopes of an element


  4. James Chadwickconfirmed the existence of the neutron


  5. Dalton's Atomic Theorynumber of representative particles in a mole, 6.02 X 10^23


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