Question

Compare the stability of oxidation states
of 3d series elements with those of 4d
and 5d series elements.​

Answer 1

Answer:

through current that have

Answer 2

The comparison of stability of oxidation states of transition series :

• The oxidation state of the 3d series is lesser than that of 4d and 5d series. There are 3 transition series in the d block .

• The oxidation state is increases down the series, means 3d have less O.S than 4d and 5d .

• 3d series:
• As comparative to 4d and 5d series they have small size and in this the low oxidation state is more stable like +2 and +3 .

• Example : Co form many stable complexes with +2 and , +3 and same Fe also can form. But in the 4d and 5d series like Rh, It they are unable to form stable complexes in this oxidation state.

• Here , in group 9 Co shows +2 and +3 O.S and in group 8 Fe also show this valency . +3 is the highest valency in this series .

• 4d and 5d series :
• In this due to lanthanoid contraction the size of elements is similar in both the series. Here the , high oxidation number is more stable.

• Example : Rh , Os show +4,+6,+8 oxidation state . So, here the highest oxidation state is+8.