Q.
An element with Z = 71 belongs to ……group……..period and ………block of modern periodic table
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a
15, 6, p
b
7, 6, d
c
9, 6, d
d
3, 6, f
answer is D.
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Detailed Solution
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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