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Why do some exceptions to the general electronic configuration of d-block elements exists?


There is a very less energy difference between (n – 1) d and ns orbitals because of which there exists exceptions to the general electronic configuration.

 
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The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

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Why Cr and Cu show exceptional configuration?
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Why are transition elements so named?
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Why Zn, Cd and Hg are not regarded as transition elements?
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Write the general electronic configuration of d-block elements.
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Name the first element of 3rd transition series.

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Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

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Why are transition elements known as d-block elements?
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Why the melting points of transition elements are high?
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