What is the core notation for the electron configuration of a cobalt(II)ion,CO₂+?

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Cobalt (Co) has an atomic number of 27, which means in its neutral state, it has 27 electrons. The electron configuration for neutral cobalt is [Ar] 4s2 3d7. When it becomes a cobalt(II) ion (Co²⁺), it loses two electrons. These two electrons are removed from the 4s orbital before the 3d orbital, resulting in the electron configuration [Ar] 3d7 for Co²⁺.

What Is the Core Notation for the Electron Configuration of a Cobalt(II)ion,CO₂