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Why does manganese, atomic number 25, have a less favorable e ea than its neighbors on either side?

Respuesta :

barnuts

This is actually a result from managese’s electron configuration. It has three 5d electrons, so one electron can go into each of the 5 d orbitals unpaired. However when adding another electron into the orbital, we are Starting to pair previously unpaired electrons. This pairing is accompanied by a small energy barrier which makes it less affinity

Chlidonias

Electron affinity is the energy released when an electron is added to neutral gaseous atom in it's ground state. The atomic number of Manganese is 25. So, it's electronic configuration is [tex][Ar]3d^{5}4s^{2}[/tex]. It has half filled d configuration. Half filled or completely d orbitals provide extra stability to the element. So, manganese would not accept an electron easily. Therefore, due to the stable outermost configuration, Mn has a less favorable electron affinity than it's neighbors.

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