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The d-And-f-Block Elements
What are transition elements? Discuss their magnetic properties.
The transition elements are also known as the d-block elements, because while the outermost level contains at most two electrons, their next to outermost main levels have incompletely filled d sub-orbitals, which are filled-up progressively on going across the periodic table from 8to 18 electrons.
General electronic configuration of d - block element is (n – 1) d1–10 ns1-2.
Magnetic property depend on the number of unpaired electron present in it. In transition element magnetic property increase upto Mn and decrease, because first number of electron increase upto Mn and after that pairing occur and thus number of unpaired electron decrease and hence magnetic property decrease.
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How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?
The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?
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