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4 Written questions

4 Multiple choice questions

  1. a tabular arrangement of the chemical elements according to atomic number as based on the periodic law
  2. Vertical column in the periodic table
  3. recurring or reappearing from time to time
  4. elements belonging to group two on the periodic table. They are less reactive and harder than alkali metals.

4 True/False questions

  1. Noble Gasseshighly reactive, group 1


  2. periodhorizontal row of elements in the periodic table


  3. HalogensVertical column in the periodic table


  4. Henry Moseleythe principle that chemical properties of the elements are periodic functions of their atomic numbers