An element with Z = 76 belongs to……group of modern periodic table
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=108, 76, 44, 26….belong to 8th(VIIIB) group;
(108-32)=76; (76-32)=44; (44-18)=26;
(n-1)d1-10ns1-2 ;
Note : Many elements of d-block have anomalous configuration. So only GEC of each group is highlighted;
Z = 26…….Fe… 4s23d6…….n=4…..4th period…..d-block….…..8th group;
Z = 44…….Ru………….….….n=5….5th period……d-block……...8th group;
Z = 76…….Os…………..……n=6….6th period…….d-block…..…8th group;
Z = 108…..Hs…………..…….n=7…..7th period……d-block..……8th group;