The involvement of (n – 1)d electrons in the behaviour of transition elements impart certain distinct characteristics to these elements. Thus, in addition to variable oxidation states, they exhibit paramagnetic behaviour, catalytic properties and tendency for the formation of coloured ions. The transition metals react with a number of non-metals like oxygen, nitrogen and halogens. KMnO₄ and K₂Cr₂O₇ are common examples. The two series of inner transition elements, lanthanoids and actinoids, constitute the f-block of the periodic table. In the lanthanoids, there is regular decrease in atomic size with increase in atomic number due to the imperfect shielding effect of 4f-orbital electrons which causes contraction.

Question

CASE_STUDIESGeneral Characteristics of Transition MetalsLanthanide Contraction and Its ConsequencesCBSE PYQ4 sub-questions

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Account for the following :

Account for the following :

CASE_STUDIES

General Characteristics of Transition Metals

Variable Oxidation States of Transition Metals

Colour of Transition Metal Compounds

What is Lanthanoid contraction ? What is the cause of Lanthanoid contraction ? Write two consequences of Lanthanoid contraction.

Answer the following questions on the basis of the figure given below :

Write any two consequences of Lanthanoid Contraction.

Name the element of 3d series which exhibits the largest number of oxidation states. Give reason.