question_answer 26)

  In Mendeleev's periodic table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later? (a) Germanium                 (b) Chlorine                        (c) Oxygen                          (d) Silicon

Answer:

                  (a) Mendeleev's left some gaps in the periodic table for those elements which were not known at that time. Germanium element found a place in the periodic table later and Mendeleev's predictions were found to be remarkably correct.