A) lanthanide contraction
B) the fact that successive addition of d -electrons screen the outer electrons (4s-) from the inward pull of the nucleus
C) increase in radii due to increase in n is compensated by decrease in radii due to increase in Z
D) atomic radii do not remain constant but decrease in a normal gradation
Correct Answer: B
Solution :
The radii of the elements from Cr to Cu, however, are very close to one another. This is due to the fact that successive addition of c/-electrons screen the outer electrons (4s -) from the inward pull of the nucleus. As a result, the size of the atom does not alter much in moving from chromium to copper.
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