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Among Ce(4f^(1)5d^(1)6s^(2)), Nd(4f^(4)6...

Among `Ce(4f^(1)5d^(1)6s^(2)), Nd(4f^(4)6s^(2)),Eu(4f^(7)6s^(2))" and " Dy(4f^(10)6s^(2))`, the element having highest and lowest 3rd ionization energies, respectively are

A

Nd and Ce

B

Eu and Ce

C

Cu and Dy

D

Dy and Nd

Text Solution

Verified by Experts

The correct Answer is:
B
Highest `3^(rd) I.E. =E4(4f^(7)6s^(2))`
3rd I.E. `Eu^(2+) to Eu^(3+)+e^(Θ)` removal of `E^(Theta)` from half filled `E^(Theta)` configuration
Lowest `3^(rd) I.E= Ce (4f^(1)5d^(1)6s^(2))`
3rd `E^(Theta)` removal from 5d
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