Answer :
Answer:
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When electrons are removed, they are always removed from the outermost or valence shell. Because the outer shell is maximum shielded from the influence of the nucleus, and hence lower energy is required to extract electrons from the outermost shell than from an inner shell. Since 4s orbital lies in the fourth shell, and 3d in the third shell, So, 4s electrons being shielded from the nucleus by the inner 3d orbitals. Hence electrons are removed from 4s orbitals insted of 3d orbitals. So when iron oxidizes electrons are removed from 4s orbitals first.
Oxidization is the process of losing electrons. As iron is oxidized, it loses electrons from valence shell instead of highest energy shell because 4s orbital lies in the fourth shell, and 3d in the third shell and the 4s electrons being shielded from the nucleus by the inner 3d orbitals.
What is highest energy shell?
The topmost shell has the utmost energy. So, the valence shell has the highest energy.
Energy is in the form of potential energy to allow the electrons to bind to the nucleus.
4s orbital lies in the fourth shell, and 3d in the third shell and the 4s electrons being shielded from the nucleus by the inner 3d orbitals.
Thus, iron is oxidized, it loses electrons from valence shell instead of highest energy shell.
For more details regarding energy shell, visit:
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