Question

(i) Write down any three difference between Lanthanoid and Actinoid ?
(ii) The melting and boiling points of Zy. Cd and Hg are low. Why ?
(iii) Draw the structure of manganate ion.

Answer 1

(i)

A)All lanthanides are non radiaactive,but actines are radio active in the nature.

B)Lanthanides do not form oxo -cations but aidines form oxocatines such as $U{O}^{+},Pu{O}^{+},NP{O}_2^{+}$.

C)Most of lanthanoids are colourless in nature but most of the actinides are coloured ions.

(ii)Melting and boiling points of $Zn,Cd,Hg$ are low.

(iii)Refer to image.