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Consider the following statements regarding the Mendeleev periodic table. Identify the correct ones.
  1. Elements were arranged in increasing order of atomic weights in horizontal rows called 'groups' and vertical columns called ''periods'.
  2. Elements in the same group had the same 'valency' and similar chemical properties.

1. Only I
2. Only II
3. Both I & II
4. None I & II

1 Answer

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Best answer
Correct Answer - Option 2 : Only II

The correct answer is Option(2) .i.e.Only II.   

  • At increasing order of atomic weights, the elements were arranged in horizontal rows called 'periods' and vertical columns called ''groups'.
  • Elements in a similar group had the same 'valency' and the same chemical properties. 
  • Mendeleev’s Periodic Table: 
    • Mendeleev introduced a table that consists of elements, called Mendeleev’s periodic table
    • In the increasing order of their atomic masses, he arranged the elements accordingly.
    • This arrangement posses Mendeleev to place elements in horizontal rows known as periods & vertical columns known as groups.
  • Periodic Law of Mendeleev: 
    • The chemical & physical properties of elements are periodic functions according to their atomic weights.  
    • The following table of Mendeleev shows the list of elements with respective atomic masses
Series Group I Group II Group III Group IV Group V Group VI Group VII Group VIII
1 H=1              
2 Li = 7 Be = 9.4 B = 11 C = 12 N = 14 O=16 F = 19  
3 Na=23 Mg=24 Al=27.3 Si=28 P=31 S=32 Cl = 35.5  

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