In forming ions of the first series of transition metals, the 4s electrons are lost before the 3d electrons.

Name: In forming ions of the first series of transition metals, the 4s electrons are lost before the 3d electrons.
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This is known as the Aufbau principle, which states that electrons will fill lower energy levels before higher energy levels. Therefore, the 4s electrons are lost first before the 3d electrons in transition metal ions.

In Forming Ions of the First Series of Transition Metals