The lanthanoid contraction refers to the overall decrease in atomic and ionic radii from lanthanum to lutetium. It is a unique feature in the chemistry of the lanthanoids and has far-reaching consequences, particularly in the third transition series.
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The chemistry of actinoids is more complex due to a wide range of oxidation states and the complications arising from their radioactivity. The occurrence of various oxidation states and the challenges posed by radioactivity make the study of actinoids more ...
Lanthanoids closely resemble each other more than ordinary transition elements in any series. They exhibit only one stable oxidation state, providing an excellent opportunity to examine the impact of small changes in size and nuclear charge along the series.
The f-block consists of the lanthanoids and actinoids. Lanthanum, closely resembling lanthanoids, is typically included in discussions of the lanthanoids, often denoted by the general symbol Ln.
Acidified permanganate solution acts as a powerful oxidizing agent, converting oxalates to carbon dioxide, iron(II) to iron(III), nitrites to nitrates, and iodides to free iodine through oxidation reactions.
Manganate and permanganate ions adopt tetrahedral geometry, with p-bonding occurring through the overlap of p orbitals of oxygen with d orbitals of manganese. The paramagnetism of green manganate arises from one unpaired electron, while permanganate is diamagnetic due to the ...
Manganese compounds exhibit intense color and diamagnetism with temperature-dependent weak paramagnetism. The explanation lies in molecular orbital theory, which involves the overlap of p orbitals of oxygen with d orbitals of manganese.
Industrial alloys include brass (copper-zinc) and bronze (copper-tin), where transition metals combine with non-transition metals. These alloys, such as brass and bronze, are of considerable importance in various industrial applications.
The ability of transition metals to adopt multiple oxidation states and form complexes underlies their catalytic activity. Examples include vanadium(V) oxide in the Contact Process, finely divided iron in Haber’s Process, and nickel in Catalytic Hydrogenation.
Catalysis at a solid surface, especially by first-row transition metals utilizing 3d and 4s electrons for bonding, involves the formation of bonds between reactant molecules and catalyst surface atoms. This increases reactant concentration at the catalyst surface and weakens bonds ...