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  • Give answer! The number of d-electrons in Fe2+(Z = 26) is not equal to the number of electrons in which one of the following ?

The number of d-electrons in Fe2+(Z = 26) is not equal to the number of electrons in which one of the following ?

  • Option 1)

    d - electrons in Fe (Z = 26)

  • Option 2)

    p - electrons in Ne (Z = 10)

  • Option 3)

    s - electrons in Mg (Z = 12)

  • Option 4)

    p - electrons in CI (Z =17)

 

Answers (1)

best_answer

 

Size of isoelectronic species -

Smaller the value of  z/e, larger the size of that species.Smaller z means effective nuclear charge is small hence size is large.

-

 

 Fe(26) = 1s2 2s2 2p6 3s2 3p6 4s2 3d6

Fe2+ (26) = 1s2 2s2 2p6 3s2 3p6 4s1 3d5

Number of d electron in Fe2+ = -5

For Cl (17) = 1s2  2s2 2p6 3s2 3p5

so number of d electron in Fe2+ is same as number of P electron in cl

 


Option 1)

d - electrons in Fe (Z = 26)

Option is incorrect

Option 2)

p - electrons in Ne (Z = 10)

Option is incorrect

Option 3)

s - electrons in Mg (Z = 12)

Option is incorrect

Option 4)

p - electrons in CI (Z =17)

Option is correct

Posted by

divya.saini

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