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But once the electrons are actually in their designated shell the energy order changes and the 4s electrons now have a higher energy level than the 3d. And because the electrons in the highest energy level are removed first when ions are formed, the 4s electrons will be removed first.
Ni2+: - 1s2 2s2 2p6 3s2 3p6 3d8
Cr3+: - 1s2 2s2 2p6 3s2 3p6 3d3
Zinc
Zn only forms Zn2+ ions as it has full 3d sub shell and the 3d10 arrangement is a very stable arrangement.
Manganese
The most stable ions for manganese are the Mn2+ ad the Mn7+. This is because it has a structure of [Ar] 3d5 4s2. This means it is capable of losing either just the 4s electrons in which case it forms the Mn2+ ion or all of the 3d and the 4s electron in which case it forms the Mn7+...
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