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(A) The covalent radii of elements decrease as we move from left to right across a period due to an increase in effective nuclear charge.For the pair

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$K, Ca$

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(A) The covalent radii of elements decrease as we move from left to right across a period due to an increase in effective nuclear charge.For the pair $K$ and $Ca$,$K$ is an alkali metal (Group $1$) and $Ca$ is an alkaline earth metal (Group $2$).Since $K$ is at the extreme left of the period and $Ca$ is next to it,the decrease in size from $K$ to $Ca$ is significant due to the large difference in effective nuclear charge.In contrast,$Mn, Fe, Co, Ni,$ and $Cr$ are all $d$-block transition elements where the increase in nuclear charge is balanced by the shielding effect of $d$-electrons,leading to a much smaller variation in atomic radii.Therefore,the difference in covalent radii is maximum for the pair $K, Ca$.

In which of the following pairs,the difference between the covalent radii of the two metals is maximum?

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