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The d-And-f-Block Elements
In what way are the observed oxidation states of the lanthanides related to their electronic configurations?
The lanthanum (At. No. 57) has the outer electronic configuration 5d1 6s2 and has the oxidation number 3.
Similarly next element cerium (At. No. 58) has the outer electronic configuration 4f15d16s2 and has the oxidation number 4. Thus we see that the oxidation number of lanthanides are well related to electronic configurations of lanthanides.
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The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?
Name the first element of 3rd transition series.
Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?
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