Assign reasons for the following:
What is lanthanoid contraction ? Explain its any one consequence.

Reason of lanthanoid contraction is

What is meant by 'lanthanoid contraction'?

Assign reasons for the following: Why is the chemistry of all lanthanoids indential ?

Which of the following facts are not explainable by lanthanoid contraction

Assign reasons for the following : (i) The enthalpies of atomisation of transition elements are high. (ii) The transition metals and many of their compounds act as good catalyst. (iii) From element to element the actinoid contraction is greater than the lanthanoid contraction. (iv) The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) . (v) Scandium (Z = 21) does not exhibit variable oxidation states and yet it is regarded as transition element.

Which of the following is not a consequence of the Lanthanoid contraction?

Which of the following is not a consequence of the Lanthanoid contraction?

Assign reasons for the following : (a) Co^(2+) has higher magnetic moment than Ni^(2+)

Assign reason for the following: In solid state, PCI_5 , behaves as an ionic species.

Assign reasons for the following : (i) lonic bond is non-following: (ii) lonic bond is non-directional (iii) lonic compounds have high melting points.