ChemistryAn element with Z = 74 belongs to…….period of modern periodic table

An element with Z = 74  belongs to…….period of modern periodic table

  1. A
    4
  2. B
    3
  3. C
    5
  4. D
    6

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    Solution:

    Hints to predict the position of element in the Modern periodic table :

    1)Elements from Z = 58-71……Lanthanoids…..4f series….6th period……3rd(IIIB) group;

    2)Elements from Z = 90-103……Actinoids…..5f series….7th period……3rd(IIIB) group;

    3)Elements from Z = 104-118………..Last two digits gives group number….. 7th period;

    4)Elements from Z = 31-57….subtract 18 to get preceding element;

    5)Elements from Z = 72-89….subtract 32 to get preceding element;

    6)Elements from Z = 104-120….subtract 32 to get preceding element ;

    For Z=104-120….simplest Hint

    7)Elements from Z = 104-120….subtract 82 to get a lower member(Z<30) belonging to same group;

    Hints 4, 5 and 6 can be used repeatedly until an element belonging to same group with Z < 30 is obtained;

    Elements with Z < 30 with their group, period and block can be known from Electronic configuration;

    Ex : Z=106, 74, 42, 24….belong to 6th(V1B) group;

    (106-32)=74; (74-32)=42; (42-18)=24;

    (n-1)d1-10ns1-2 ;

    Note : Many elements of d-block have anomalous configuration. So only GEC of each group is highlighted;

    Z = 24…….Cr…  4s13d5….….n=4…..4th period……d-block….….6th group;

    Z = 42…….Mo………….….….n=5….5th period……d-block……...6th group;

    Z = 74…….W…………..………n=6….6th period……..d-block…..……6th group;

    Z = 106….Sg…………..……n=7…..7th period……d-block..……. 6th group;

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