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An element with Z = 58  belongs to ….block of modern periodic table

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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;Ce(Z=58), Pr(Z=59), Nd(Z=60), Pm(Z=61), Sm(Z=62), Eu(Z=63), Gd(Z=64) ;Tb(Z=65), Dy(Z=66), Ho(Z=67), Er(Z=68), Tm(Z=69),  Yb(Z=70), Lu(Z=71) ;

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