Explain variable oxidation states in transition metals.

In the subtopic Transition-metal characteristics (A-level only), this AQA A-Level Chemistry 7405 learning objective focuses on explain variable oxidation states in transition metals. It belongs to Transition metals (A-level only), so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include transition metal, variable oxidation state. Variable oxidation state. means the ability of transition metals to exhibit multiple oxidation states due to the involvement of d electrons in bonding Avoid the mistake of students often confuse the oxidation states of transition metals, thinking they can only exist in one state rather than multiple states; instead, to clarify, remember that transition metals can exhibit variable oxidation states due to the involvement of d electrons in bonding. For example, iron can exist in +2 and +3 oxidation states. Always refer to the specific metal and its electron configuration to determine possible oxidation states For exam answers, remember that transition metals can exhibit multiple oxidation states due to their d electrons. When explaining variable oxidation states, always refer to the electron configuration and how it allows for the loss of different numbers of electrons