Question

In the given elements, Pr, Dy, Gd, Eu, Yb, Lu, the number of elements with f7 configuration are ‘’ and no. of elements with f14 configuration are ‘’, the value of is. ​

Answer 1

Answer:

ye dua hai meri rab se tumhe ashiqo me sabse meri ashiqi pasand ayee......

meri ashiqi pasand ayee....

Answer 2

Answer:

• The number of elements having $f^7$ configurations is $2$

     [ Gd and Eu ]

• The number of elements having $f^{14}$ configurations is $2$

      [ Yb and Lu ]

Step-by-step explanation:

The electronic configuration of the elements  in ascending order of orbital energies is as follows:

                                                 Number of electrons in f orbital

Pr   - $[Xe] 4f^3 6s^2$                                                 $3$

Dy  - $[ Xe]4f^{10}6s^2$                                              $10$

Gd  - $[Xe] 4f^7 5d^1 6s^2$                                           $7$

Eu  - $[Xe ]4f^7 6s^2$                                                 $7$

Yb  - $[Xe] 4f^{14} 6s^2$                                              $14$

Lu  - $[Xe]4f^{14 }5d^1 6s^2$                                         $14$

$\Therefore$$\therefore$  The number of elements having $f^7$ configurations is $2$

     [ Gd and Eu ]

     The number of elements having $f^{14}$ configurations is $2$

      [ Yb and Lu ]

#SPJ3