Transition and InnerTransition Elements - Result Question 83

####10. The element that usually does not show variable oxidation states is

(2019 Main, 11 Jan I)

(a) Sc

(b) Cu

(c) Ti

(d) V

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Solution:

  1. The most stable oxidation states in the compounds of the given transition metals of 3d-series are,

Sc:+3;Ti:+3,+4;V:+2,+3,+4,+5;Cu:+1,+2

The electronic configuration of Sc(Z=21) is [Ar]3d1,4s2.

Due to the presence of only one 3d-electron

(no pairing energy) and two 4s-electrons, they easily ionise to achieve most stable +3 oxidation state.



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