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  • (a) List any two distinguishing features between Mendeleev’s Periodic Table and the Modern Periodic Table. (b) With the help of an example, explain Dobereiner’s Triads. (c) State Modern Periodic Law.   <d

(a) List any two distinguishing features between Mendeleev’s Periodic Table and the Modern Periodic Table.
(b) With the help of an example, explain Dobereiner’s Triads.
(c) State Modern Periodic Law.

 

 
 
 
 
 

Answers (1)

(a)

Mendeleev’s Periodic Table

  • Based on atomic mass of elements
  • No place for isotopes

Modern Periodic Table

  • Based an atomic number of elements
  • Isotopes find place in it.

 (b) Example –

Li , Na , K

The atomic mass of the middle element is an average of the atomic masses of other two elements

(c)  Modern Periodic Law - Properties of elements are a periodic function of their atomic number

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Safeer PP

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