An element with Z = 108  belongs to……group of modern periodic table

detailed solution

Correct option is A

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 Hint7)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;