Here's how to determine the electron configuration of Cu⁺¹ (Copper with a +1 charge):

1. Start with the neutral copper atom:

* Copper (Cu) has an atomic number of 29, meaning it has 29 protons and 29 electrons.

* The electron configuration of neutral copper is: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰.

* Note the unusual filling order: The 4s orbital fills before the 3d orbital, but the 3d orbital gets filled first when we move to the transition metals.

2. Account for the +1 charge:

* A +1 charge means copper has lost one electron.

* Since the 4s orbital is the outermost and highest energy level, it's the electron that gets removed.

3. The final electron configuration of Cu⁺¹:

* 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰

Let me know if you have any other electron configuration questions!