what are the consequences of Lanthanide contraction
Dear Student,
The regular decrease (contraction) in the size of the atoms and ions with increasing atomic number is known as lanthanide contraction.
Lanthanoid Contraction: The steady decrease in the atomic and ionic radii of the transition metals as the atomic number increases. This is because of filling of 4f orbitals before the 5d orbitals. This contraction is size is quite regular. This is called lanthanoid contraction. It is because of lanthanoid contraction that the atomic radii of the second row of transition elements are almost similar to those of the third row of transition elements.
Thus, the regular decrease (contraction) in the size of the atoms and ions with increasing atomic number is known as lanthanide contraction.
Consequences of the lanthanide contraction are:
1) Resemblance of second and third transition series
The pair of the elements: Zr-Hf, Nb-Ta, Mo-W etc. posses almost same size.
2) Similarity among lanthanide:
Because of the same change in the radii their chemical properties are quiet similar.
3) Basicity differences:
Basic strength of the hydroxides decreases with increases in the atomic number. La(OH)3 is most basic while Lu(OH)3 is least basic.
Regards
Dear Student,
The regular decrease (contraction) in the size of the atoms and ions with increasing atomic number is known as lanthanide contraction.
Lanthanoid Contraction: The steady decrease in the atomic and ionic radii of the transition metals as the atomic number increases. This is because of filling of 4f orbitals before the 5d orbitals. This contraction is size is quite regular. This is called lanthanoid contraction. It is because of lanthanoid contraction that the atomic radii of the second row of transition elements are almost similar to those of the third row of transition elements.
Thus, the regular decrease (contraction) in the size of the atoms and ions with increasing atomic number is known as lanthanide contraction.
Consequences of the lanthanide contraction are:
1) Resemblance of second and third transition series
The pair of the elements: Zr-Hf, Nb-Ta, Mo-W etc. posses almost same size.
2) Similarity among lanthanide:
Because of the same change in the radii their chemical properties are quiet similar.
3) Basicity differences:
Basic strength of the hydroxides decreases with increases in the atomic number. La(OH)3 is most basic while Lu(OH)3 is least basic.
Regards
