The pair of lanthanides in which both element | vedclass

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(B) The third ionization energy $(IE_3)$ is high for elements that have stable electronic configurations in their $+2$ oxidation state,as removing the

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$Eu, Yb$

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(B) The third ionization energy $(IE_3)$ is high for elements that have stable electronic configurations in their $+2$ oxidation state,as removing the third electron disrupts this stability.$Eu$ $(Z=63)$ has the configuration $[Xe] 4f^7 6s^2$. Its $Eu^{2+}$ ion is $[Xe] 4f^7$,which is a stable half-filled configuration.$Yb$ $(Z=70)$ has the configuration $[Xe] 4f^{14} 6s^2$. Its $Yb^{2+}$ ion is $[Xe] 4f^{14}$,which is a stable fully-filled configuration.Therefore,both $Eu$ and $Yb$ exhibit high third-ionization energy.

The pair of lanthanides in which both elements have high third-ionization energy is:

Similar Questions

Which of the following lanthanoids shows $+4$ oxidation state to acquire noble gas configuration?
(At nos. : $La=57, Ce=58, Eu=63$ and $Yb=70$ )

Which of the following trivalent ions has the largest atomic radius in the lanthanide series?

Although $(+3)$ oxidation state is the characteristic oxidation state of lanthanoids,cerium shows $(+4)$ oxidation state also. Why?

Which of the following elements have half-filled $f$-orbitals in their ground state?
(Given: atomic number $Sm = 62$; $Eu = 63$; $Tb = 65$; $Gd = 64$; $Pm = 61$)
$A.$ $Sm$ $B.$ $Eu$ $C.$ $Tb$ $D.$ $Gd$ $E.$ $Pm$
Choose the correct answer from the options given below:

Which of the following statements concerning lanthanide elements is false?

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