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Transition Elements

Which of the ...

Question

Which of the following transition elements will have a half-filled d-orbital?

A

Titanium (Ti)

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B

Iron (Fe)

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C

Chromium (Cr)

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D

Zinc (Zn)

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Solution

The correct option is C
Chromium (Cr)

Among all the d-block elements, elements of 6th and 7th group have half filled d-orbitals. Elements of 7th group have half-filled d-orbitals by default configuration where as elements of 6th group have half filled d-orbitals because energy required to pair two electrons in the s orbitals of the next orbit is more than the energy required to put an electron in the d orbital of the previous orbit.

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Which of the following transition elements will have a half-filled d-orbital?

Q. The elements of the three transition series of the d - block are given below:

\begin{matrix} S c & T i & V & C r & M n & F e & C o & N i & C u & Z n Y & Z r & N b & M o & T c & R u & R h & R d & A g & C d L a & H f & T a & W & R e & O s & I r & P t & A u & H g \end{matrix}

In any transition series, as we move form left to right, the d - orbitals are progressively filled and their properties vary accordingly.
Which element do you expect to have the smallest atomic radius?

Q. The elements of 3d transition series are given as:

\begin{matrix} S c & T i & V & C r & M n & F e & C o & N i & C u & Z n \end{matrix}

Answer the following:
(i) Write the element which is not regarded as a transition element. Give reason.
(ii) Which element has the highest m.p.?
(iii) Write the element which can show an oxidation state of +1.
(iv) Which element is a strong oxidizing agent in +3 oxidation state and why?

Q. For the four successive transition elements

(C r, M n, F e a n d C o)

, the stability of

+ 2

oxidation state will be there in which of the following order?

Q. For the four successive transition elements \((Cr,Mn,Fe \text{and }Co)\) , the stability of +2 oxidation state in gaseous state will be there in which of the following order ?
(Atomic no. Cr=24,Mn=25,Fe=26,Co=27)

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