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  Consequences of lanthanide contraction

Consequences of lanthanide contraction:

Significant consequences of lanthanide contraction are specified below:

1) Basicity of ions:

Due to the lanthanide contraction, the size of Ln3+ ions reduces regularly with raise in atomic number. According to Fajan’s rule, reduction in size of Ln3+ ions raises the covalent character and reduces the basic character among Ln3+ and OH- ion in Ln(OH)3. As the order of size of Ln3+ ions are,

La3+ > Ce3+ ............... >Lu3+

2) There is regular reduce in their ionic radius.

3) Regular reduction in their tendency to act as reducing agent, with raise in atomic number.

4) Due to the lanthanide contraction, second and third rows of d-block transition elements are fairly close in properties.

5) Due to the lanthanide contraction, such elements take place altogether in natural minerals and are hard to separate.

 

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