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In which of the following pairs, the difference between the convalent radii of the two metals is maximum.

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In which of the following pairs, the difference between the convalent radii of the two metals is maximum.
A. `K, Ca`
B. `Mn, Fe`
C. `Co, Ni`
D. `Cr, Mn`
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Covalent radii decreases on going from left to right in periods. However, among the transition elements the size don not changes much because the electrons add to penultimate d-subshells i.e. `(n-1)` d-subshell.
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