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(a). Why do second and third rows of tra...

(a). Why do second and third rows of transition elements resemble each other more closely than the first row?
Give reasons:
(b). Most transition metals show paramagnetic behaviours.
(c). Transition metal and their many compounds are coloured.

Text Solution

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(a). Due to lanthanoid contraction, the difference between the radius of second and third group elements is negligible. As a result they have similar lattice energies, solvation enegies. Ionisation energies and other properties.
(b). Many transition metals contain partially filled electron shells. The unpaired electrons produce spin magnetic moments which results into paramagnetism.
(c). Colour arises from the ability of a compound to absorb particular wavelengths of white light and emit the rest. This can occur when there is/are electrons / charge which can he transferred from an energy level to another which is the case with transition elements and their compounds.
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