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Transition and Inner Transition Elements — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryTransition and Inner Transition Elements3 Marks
Question
Explain the metalic character of transition metals.
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Answer

$1.$ All the transition elements are metals.
$2.$ They are hard, lustrous, malleable, ductile and they have high tensile strength.
$3.$ They have high melting points and boiling points.
$4.$ Their metallic character is due to vacant or partially filled $(n – 1) \ d-$orbitals, and they involve both metallic and covalent bonding.
$5.$ Since the strength of metallic bonds depends upon the number of unpaired electrons, it increases up to middle i.e., up to $(n – 1 )d^5,$ hence accordingly melting points and boiling points also increase.
$6.$ After $(n – l)d^5$ configuration, the electrons start pairing, hence the metallic strength, melting points and boiling points decrease with the increase in atomic number.

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