Since these metals are becoming cations (+), it means that they are losing electrons, thus you would pull them off the outer most orbital.

Cr and Cu have unique configurations because they steal electrons from the 4s because they prefer to be half-full or full orbitals. So if you have 4 electrons in the 3d, like in Cr, it is more energetically favorable to have 5 electrons in the 3d and have a half-filled subshell since the 3d has 5 orbitals, so you would pull an electron from the 4s.


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