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The atomic radii of transition elements ...

The atomic radii of transition elements from Cr to Cu are almost equal because

A

Increased effective nuclear chargeis balanced by decreased screening effect of electrons in (n- 1) d -orbitals

B

Increased effective nuclear charge is balanced by increased screening effect of ( n-1)d-orbitals

C

Decreased effective nuclear charge is balanced by increased screening effect fo electrons in ( n -1 ) d- orbitals

D

None of these

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The correct Answer is:
B
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