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5 Written questions

5 Matching questions

  1. The atomic number of an atom is defined as its
  2. Most of the volume of an ato is occupied by the
  3. as the atomic masses of the elements in the periodic table increase, th number of atoms in a mole of each element
  4. An atom of potassium has 19 protons and 21 neutrons. What is its mass number?
  5. The average atomic mass of an element depends on both the masses of its isotopes and each isotope's
  1. a 40
  2. b remains the same
  3. c number of protons
  4. d electron cloud
  5. e relative abundance

5 Multiple choice questions

  1. amu
  2. retains the chemicl identity of that element
  3. Thomson
  4. all atoms contain electrons
  5. electron

5 True/False questions

  1. the composition of the two oxides of lead, PbO and PbO2, are explained by thelaw of multiple proportions.


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


  3. The number of atoms in a mole of any pure substance is callednumber of protons


  4. The nucleus of most atoms is composed ofThomson


  5. The mass number of an atom is defined as itsnumber of protons