. The number of delectrons in
Fe2+(Z=26) is not equal to the number of electrons in which one of the following?
(a) d-electrons in Fe( Z=26)
(b) p-electrons in Ne(Z=10)
(c) s-electrons in Mg(Z=12)
(d) p-electrons in Cl(Z=17)
Correct Option is :(d)
Number of d- electrons in Fe2+= 6
d-electrons in Fe= 6 (3d6)
p-electrons in Ne= 6 (2p6)
s-electrons in Mg= 6 (1s2, 2s2, 3s2)
p-electrons in Cl= 11(2p6, 3p5)
Hence the correct option will be 4.