Question about electron configuration with cations So when I do the EC for an io

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Question about electron configuration with cations
So when I do the EC for an ion with a charge, I just move that many times (left or right and do the cross method). For example with Fe^2+ and V^3+ I get the following answers, [Ar]4s^2 and [Ar]4s^2 but the answers come out different. It seems as if the valence electrons from the other side just take up the electrons from the smaller valence electrons. Does this only apply to cations? I do the cross method and shift (left if +/right if -) when trying to find the EC, but the cations are different. Thank you! Question about electron configuration with cations
So when I do the EC for an ion with a charge, I just move that many times (left or right and do the cross method). For example with Fe^2+ and V^3+ I get the following answers, [Ar]4s^2 and [Ar]4s^2 but the answers come out different. It seems as if the valence electrons from the other side just take up the electrons from the smaller valence electrons. Does this only apply to cations? I do the cross method and shift (left if +/right if -) when trying to find the EC, but the cations are different. Thank you! Question about electron configuration with cations
So when I do the EC for an ion with a charge, I just move that many times (left or right and do the cross method). For example with Fe^2+ and V^3+ I get the following answers, [Ar]4s^2 and [Ar]4s^2 but the answers come out different. It seems as if the valence electrons from the other side just take up the electrons from the smaller valence electrons. Does this only apply to cations? I do the cross method and shift (left if +/right if -) when trying to find the EC, but the cations are different. Thank you! Question about electron configuration with cations
So when I do the EC for an ion with a charge, I just move that many times (left or right and do the cross method). For example with Fe^2+ and V^3+ I get the following answers, [Ar]4s^2 and [Ar]4s^2 but the answers come out different. It seems as if the valence electrons from the other side just take up the electrons from the smaller valence electrons. Does this only apply to cations? I do the cross method and shift (left if +/right if -) when trying to find the EC, but the cations are different. Thank you!

Explanation / Answer

Fe atomic number 26 and electronic configuration = 1S22S22p63s2 3p63d6 4s2 by loosing its two valency electrons (4s2) it becomes Fe2+

Fe2+ = 1S22S22p63s2 3p63d6

Vandium atomic number 23 and electronic configuration = 1S22S22p63s2 3p63d3 4s2 by loosing its three electrons (two 4s electrons and one 3d electron ) it becomes V3+

V3+ = 1S22S22p63s2 3p63d2

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