Please tell

Asked by  | 20th Jan, 2009, 01:56: PM

Expert Answer:

Lanthanoides are the elements in which the last electron enter into 4f orbital.

Actioides are the elements in which the last electron enter into 5f orbital.

They are kept at the bottom of periodic table because of later discovered.

Answered by  | 21st Jan, 2009, 10:28: AM

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