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Asked by | 20 Jan, 2009, 01:56: PM
answered-by-expert 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 | 21 Jan, 2009, 10:28: AM

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