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AP EAMCET2005ChemistryClassification of Elements and Periodicity in Properties

Identify the correct order in which the covalent radius of the following elements increases (I) Ti (II) Ca (III) Sc

Options

  1. A(I), (II), (III)
  2. B(III), (II), (I)
  3. Carray lll ( II ), & (I) , (III) array
  4. D(I), (III), (II)

Correct answer

D. (I), (III), (II)

Step-by-step solution

aligned & ₂₀ Ca =[ Ar ] 4 s^2 & ₂₁ Sc =[ Ar ] 4 s^2, 3 d^1 & ₂₂ Ti =[ Ar ] 4 s^2, 3 d^2 aligned As d -orbital have diffused shape, hence their electron shields nuclear charge upto lesser extent. Hence, due to increase in effective nuclear charge (Z_ eff ) , atomic size decrease, in the following order, Ca > Sc > Ti

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