1.

Account for the following :(a) All Scandium salts are white.(b) The Ist ionization energy of the 5d series are higher than 3d and 4d transition elements in respective groups.(c) Ce+3 can be easily oxidized to Ce+4.

Answer»

(a) Sc has only + 3 oxidation state, there is no unpaired electron.
(b) Due to lanthanide contraction, effective nuclear charge increase.
(c) Due to gain noble gas electron conflguration.



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