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5 Written questions

5 Matching questions

  1. the composition of the two oxides of lead, PbO and PbO2, are explained by the
  2. Who expl;ained the behavior of positively charged particles being delected from a metal foil as the nucleus?
  3. What did Rutherford conclude about the structure of the atom
  4. The average atomic mass of an element depends on both the masses of its isotopes and each isotope's
  5. The number of atoms in a mole of any pure substance is called
  1. a An atom contains a small, dense, positively charged central region
  2. b relative abundance
  3. c law of multiple proportions.
  4. d Ernest Rutherford
  5. e Avogadro's number

5 Multiple choice questions

  1. contains nearly all of the atom's volume
  2. 30
  3. 27
  4. the number of protons and electrons are equal
  5. about the same as that of a proton

5 True/False questions

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


  2. A nuclear particle taht has about the same mass as a proton but with no electrical charge is called a(n)neutron


  3. An atom of potassium has 19 protons and 21 neutrons. What is its mass number?40


  4. The mass number of an atom is defined as itstotal number of protons and neutrons


  5. Who first propsed an atomic theory based on scientific knoledgetotal number of protons and neutrons


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