The dand fblock elements - Result Question 5

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

[2015]

(a) p-electrons in Cl(Z=17)

(b) d-electrons in Fe(Z=26)

(c) p-electrons in Ne(Z=10)

(d) s-electrons in Mg(Z=12)

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Solution:

  1. (a) Fe+2=3d6 (number of ’ d ’ electrons =6)

In Cl=1s22s22p63s23p5

total p electrons =11, which are not equal to number of ’ d ’ electrons in Fe+2

p-electrons in Ne=1s22s22p6=6

s-electrons in Mg=1s22s22p63s2=6



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