Question

position and trend in the perodic table and advantage and disadvantages of perodic table?​

Answer 1

ADVANTAGES

• Systematic and scientific study of elements

          By knowing the properties of elements in a particular group , the properties of the rest of the elements can be predicted.

• Discovery of new elements

           Mendeleev left some gaps for the elements to be identified.

He called these elements as:

1.   Eka Boron (Scandium)
2.   Eka  Silicon(Germanium)
3. Eka Aluminium(Gallium)

• Correction of doubtful atomic masses.                  

         His periodic table helped in correcting the atomic masses of some elements based on their positions in the periodic table.

DISADVANTAGES

• Position of hydrogen

          a correct position for H could not be assigned in the periodic table.       Hydrogen could be placed both in alkali as well as halogen group.

• Anomalous position of some elements

        In some cases elements with higher atomic mass preceded the elements with lower atomic mass.

• position of isotopes

Periodic table is based on atomic weight. So isotopes should be placed in different position.

• Grouping of Elements

      some similar elements seperated and dissimilar elements were grouped together.

• Position of lanthanides and actinides

They were not given proper places in the periodic table.

•     Position of metals and non metals.

          Most of the groups were mixed groups,containing of metals,non-metals and metalloids.

• Force of periodicity

     He didn't explain the force of periodicity among the elements.

• position for noble gases

   Mendeeleev's original periodic table did not indicate any of the noble  gases, which were discovered later . They were added by Sir William   Ramsay as group zero, without the disturbance to the basic concept of periodic table.

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