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Science X A

Date of submission:  5/1/11

Mrs.K C Usha Devi, TGT Bio

Chapter:  Periodic Classification of elements

Home work:

  1. Use Mendeleeve’s periodic Table to predict the formulae for the oxides of the following elements:-

    K, C, AL, Sl, Ba

  1. Besides gallium which other elements have been discovered that were left by Mendeleeve in his periodic table?
  2. What were the criteria used by Mendeleev in creating his periodic Table?
  3. Why do you think that the noble gases are placed in a separate group?
  4. In the modern periodic table, which are the metals among the first 10 elements

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