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  • Solve this problem The electronic configurations of Eu(Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are

The electronic configurations of Eu(Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are

  • Option 1)

    \left [ Xe \right ]4f^{7}6s^{2}, \left [ Xe \right ]4f^{8} 6s^{2} and \left [ Xe \right ]4f^{8}5d^{1}6s^{2}

  • Option 2)

    \left [ Xe \right ]4f^{7}5d^{1}6s^{2}, \left [ Xe \right ]4f^{7} 5d^{1} 6s^{2}  and \left [ Xe \right ]4f^{9}6s^{2}

  • Option 3)

    \left [ Xe \right ]4f^{6}5d^{1}6s^{2}, \left [ Xe \right ]4f^{7}5d^{1}6s^{2} and \left [ Xe \right ]4f^{8}5d^{1}6s^{2}

  • Option 4)

    \left [ Xe \right ]4f^{7}6s^{2}, \left [ Xe \right ]4f^{7}5d^{1}6s^{2} and \left [ Xe \right ]4f^{9}6s^{2}

 

Answers (1)

best_answer

 

Electronic configuration -

The lanthanoid follow the  4f1-14  5d0-1  6s2  configuration (common configuration)with some exception due to full filled half filled electronic configuration.

 

- wherein

eg\rightarrow 4f^{1}5d^{1}6s^{2}

 

 Electronic config of E_{u}63=\left [ X_{e} \right ]4f^{7}6s^{2}

 Electronic config of G_{d}64=\left [ X_{e} \right ]4f^{7}5d^{1}6s^{2}

 Electronic config of T_{b}65=\left [ X_{e} \right ]4f^{9}6s^{2}

 

 


Option 1)

\left [ Xe \right ]4f^{7}6s^{2}, \left [ Xe \right ]4f^{8} 6s^{2} and \left [ Xe \right ]4f^{8}5d^{1}6s^{2}

Incorrect Option

Option 2)

\left [ Xe \right ]4f^{7}5d^{1}6s^{2}, \left [ Xe \right ]4f^{7} 5d^{1} 6s^{2}  and \left [ Xe \right ]4f^{9}6s^{2}

Incorrect Option

Option 3)

\left [ Xe \right ]4f^{6}5d^{1}6s^{2}, \left [ Xe \right ]4f^{7}5d^{1}6s^{2} and \left [ Xe \right ]4f^{8}5d^{1}6s^{2}

Incorrect Option

Option 4)

\left [ Xe \right ]4f^{7}6s^{2}, \left [ Xe \right ]4f^{7}5d^{1}6s^{2} and \left [ Xe \right ]4f^{9}6s^{2}

Correct Option

Posted by

prateek

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