Question

Give the electronic configuration of Fe³⁺
{ CLASS IX }

Answer 1

in Fe+3 three electrons less then Fe atoms
no of electrons in Fe+3 ion =23

now, configuration of Fe+3 ,

1s^2 , 2s^2 , 2p^6 , 3s^2, 3p^6, 4s^2, 3d^3
but here for stability of d -subshell ( half fill or full fill subshell stable ) two electrons comes from s to d

now,
configuration of Fe+3 ,

1s^2, 2s^2, 2p^6, 3s^2, 3p^6 ,4s^0 , 3d^5

Answer 2

Fe 3+
atomic number = 26
electrons = 23
proton = 26
neutron = 30

electronic configuration =
2,8,8,5