| Lanthanides | Actinoids |
| i) Last electron is entering in $4f$ sub shell. | i) Last electron is entering in $5f$ subshell. |
| ii) They are arranged in sixth period of periodic table. | ii) They are placed in seventh group of periodic table. |
| iii) They are the part of third transition and first inner transition series. | iii) They are the part of forth transition and second inner transition series. |
| iv) Except Promethium all are naturally occurring elements. | iv) Most of them are synthetically prepared. |
| v) Binding energy of $4f$ orbital is high. | v) Binding energy of $5f$ orbital is low. |
| vi) Except promithium all are non-radioactive. | vi) All are radioactive elements. |
| vii) With $+3$ they show $+2$ and $+4$ oxidation states. | vii) With $+3$ they show $+2$, $+4$, $+5$ and $+7$ oxidation states. |
| viii) They have less tendency to form complex. | viii) They have more tendency to form complexes. |
| ix) They does not form oxocations. | ix) They form oxocations like $U{O_2}^{ + 2}$, $Pu{O_2}^{ + 2}$, $U{O^ + }$. |
| x) Their hydroxides are less basic. | x) Their hydroxides are relatively more basic. |
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