Identify the correct order in which the covalent radius of the following elements increases.
Q I. TI II.Ca III. Sc

Options

A. (I), (II) ,(III)
B. (III), (II) ,(I)
C. (II), (I) ,(III)
D. (I), (III) ,(II)

Answer

D

Explanation

Electronic configuration : Covalent radius
`""_(20)Ca =[Ar]`   `4s^(2)`    1 .74
  `""_(21)Sc = [Ar]`   `4s^(2) 3d^(1)`    1.44
`""_(22)Ti = [Ar]`    `4s^(2) 3d^(2)`    1.36
In Sc and Ti, due to screening of(n-1)d electrons between outer electrons and nuclear charge, the effective nuclear charge increases and atomic size decreases. Therefore the increasing order of covalent radius of given elements is : Ti