EAMCET Engineering 2005 Solved Paper

‌‌20‌Ca=[Ar]4s2
‌‌21‌Sc=[Ar]4s2,3d1
‌‌22‌Ti=[Ar]4s2,3d2
As d-orbital have diffused shape, hence their electron shields nuclear charge upto lesser extent. Hence, due to increase in effective nuclear charge (Z‌eff ‌), atomic size decrease, in the following order,
Ca>Sc>Ti