Question

In forming fe2+ from fe electrons are removed from 4s orbital and not from 3d orbital . Explain

Answer 1

Answer:

This is because electrons are removed from the orbital with highest energy present in outermost shell,

which in this case is 4s orbital.

Energy comparison : 4s > 3d

Hence electrons are first removed from 4s orbital.

Answer 2

In the formation of Fe2+ from Fe, electrons are removed from the 4s orbital and not from 3d orbital because:

1. According to the (n + l) rule, orbitals with the least value of (n + l) will be filled with electrons first. Orbitals are filled in the order of increasing energies.

For 4s, n + l = 4 + 0 = 4

For 3d, n + l = 3 + 2 = 5

Hence, 3d will be filled first.

2. During the removal of electrons, electrons from the outermost orbitals are lost. In the formation of Fe2+, 4s is the outermost orbital. Hence, electrons are removed from 4s.

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