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# An element with Z = 23  belongs to……period of modern periodic table

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a
5
b
4
c
3
d
2

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detailed solution

Correct option is B

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=105, 73, 41, 23….belong to 5th(VB) group;(105-32)=73; (73-32)=41; (41-18)=23;(n-1)d1-10ns1-2 ;Note : Many elements of d-block have anomalous configuration. So only GEC of each group is highlighted;Z = 23…….V…  4s23d3….…..n=4….4th period……d-block….…..5th group;Z = 41…….Nb………….….….n=5….5th period……d-block……...5th group;Z = 73…….Ta…………..…….n=6….6th period……d-block…..… 5th group;Z = 105……Db…………..……n=7….7th period……d-block..……. 5th group;