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Why lanthanides and actinides series are situated at the buttom of the periodic table

Sagot :

They are in the f-block, as they have f-subshells. This is due to their electronic arrangement. Their electronic arrangement is such that: in lanthanides, 4f orbitals are filled before the 5d orbitals are filled, and in actinides, 5f orbitals are filled before 6d orbitals are filled. Two photos are attached to further explain this.
View image AfroBen
View image AfroBen
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