Question

What is lanthanoid contraction ? What are the
consequences of lanthanoid contraction ?​

Answer 1

Explanation:

The steady decrease in the size of lanthanide ions with the increase in atomic number is called lanthanide contraction. Consequences: There is not regular trend in ionization potential in the group due to lanthanide contraction. Similarity of 2nd and 3rd transition group.

Answer 2

Answer:

It is the steady increase in atomic size (or ionic radii) of elements from Lanthanum to Lutetium.

Explanation:

What is Lanthanoid Contraction?

It is the steady increase in atomic size (or ionic radii) of elements from Lanthanum to Lutetium.

What causes Lanthanoid Contraction?

Lanthanoid Contraction is due to poor sheilding of nuclear charge by 4f electrons. The 6s electrons can be drawn towards the nucleus, resulting in a smaller atomic radius.

Consequences of Lanthanoid Contraction:

• The elements Zirconium (Zr) and Hafnium (Hf) have similar radii.
• Zr and Hf occur together in nature and it is difficult to separate them.
• Basic character of hydroxide diminishes.
• The capacity of Lanthanoids to form complexes is diminished.