Explain why Eu and Yb show oxidation state +2.

1.	Explain why Eu and Yb show oxidation state +2.
Answer» i. In the +2 oxidation state, Eu donates two electrons from its 6s-orbitals. In Eu⁺², 4f-orbitals are half-filled i.e., 4f⁷ which is a more stable state. ii. Similarly in the +2 oxidation state, Yb donates two electrons from its 6s-orbitals. In Yb⁺², 4f-orbitals are completely filled i.e., 4f¹⁴ which is more stable. Therefore, Eu and Yb show +2 oxidation states.

Answer»

i. In the +2 oxidation state, Eu donates two electrons from its 6s-orbitals. In Eu⁺², 4f-orbitals are half-filled i.e., 4f⁷ which is a more stable state.

ii. Similarly in the +2 oxidation state, Yb donates two electrons from its 6s-orbitals. In Yb⁺², 4f-orbitals are completely filled i.e., 4f¹⁴ which is more stable.

Therefore, Eu and Yb show +2 oxidation states.

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Explain why Eu and Yb show oxidation state +2.

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