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An element with Z = 104  belongs to……..period of modern periodic table

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detailed solution

Correct option is C

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=104, 72, 40, 22….belong to 4th(IVB) group;(104-32)=72; (72-32)=40; (40-18)=22;(n-1)d1-10ns1-2 ;Note : Many elements of d-block have anomalous configuration. So only GEC of each group is highlighted;Z = 22…….Ti…  4s23d2….…n=4….4th period……d-block….…..4th group;Z = 40…….Zr………….….….n=5….5th period……d-block……...4th group;Z = 72…….Hf…………..…….n=6….6th period……d-block…..… 4th group;Z = 104……Rf…………..……n=7….7th period……d-block..……. 4th group;