Since these metals are coming to be cations (+), it means that lock are losing electrons, for this reason you would pull them off the outer many orbital.
Cr and also Cu have unique configurations since they steal electrons from the 4s because they like to be half-full or complete orbitals. So if you have 4 electron in the 3d, prefer in Cr, the is more energetically favorable to have actually 5 electron in the 3d and have a half-filled subshell due to the fact that the 3d has 5 orbitals, so you would pull an electron native the 4s.
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