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Question answer

Question answer

4.calculate zeff 4s electron of potassium? 
ans
Zn
(30)     1s^2 2s^2 2p^6   3s^2 3p^6 3d^10   4s^2
                    n-2                           n-1                    n

S= 1×0.35 +18×0.85 + 10×1.00
S=  0.35+15.30+10.00
S= 25.65

 zeff=A-S
       = 30-25.65=4.35

5.calculate zeff 4s electron of iron? 
ans
Fe
(26)        1s^2 2s^2 2p^6   3s^2 3p^6 3d^6  4s^2
                    n-2                           n-1                    n

 S= 1×0.35 +14×0.85 + 10×1.00
S=  0.35+11.9+10.00
S= 22.25

 Zeff= 26-22.25=3.75

6.calculate zeff 3d electron of zinc? 
ans
Zn
(30)        1s^2 2s^2 2p^6 3s^2 3p^6   3d^10   4s^2
                                                                    n
        here 4s (not encluding in screening effect) 
according to rule no. 6

 S= 9×0.35  + 18×1.00
S= 21.15

 Zeff= 30-21.15=8.85

7.calculate zeff 3d electron of iron? 
ans
fe
(26)        1s^2 2s^2 2p^6 3s^2 3p^6   3d^6   4s^2
                                                                    n
        

 S= 5×0.35  + 18×1.00
S= 19.75

 Zeff= 26-19.75=6.25


8.calculate zeff 4d electron of silver? 
ans
Ag
(47) 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6
                                    4d^10   4s^1
                                        n                            
        

 S= 9×0.35  + 36×1.00
S= 39.15

 Zeff= 47-39.15=7.85

9. calculate zeff 3d electron of cerium? 
ans
Ce
(58)  1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2                              4p^6 4d^10    4f^2   5s^2 5p^6 6s^2
                                              n                      
        
S= 1×0.35  + 46×1.00
S= 46.35

 Zeff= 58-46.35=11.65






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