AQA GCSE Chemistry · 8462
Specification 4.1.3.2 · Paper 1
Revise: Typical Transition Metal PropertiesChanging the metal's oxidation state can therefore change the ratio of ions, the formula and the properties of the compound.
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GCSE Chemistry · key term
The charge associated with an element in a compound or ion, often shown by a Roman numeral in a transition-metal compound's name.
Used by AQA and OCR
Specification 4.1.3.2 · Paper 1
Revise: Typical Transition Metal PropertiesChanging the metal's oxidation state can therefore change the ratio of ions, the formula and the properties of the compound.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A number describing the apparent charge of an atom in an element, compound or ion; uncombined elements have an oxidation state of zero.
Use named evidence in extended answers: copper and iron form ions with different charges, chromium forms compounds in several oxidation states and colours, iron catalyses the Haber process, and silver and gold illustrate very low reactivity.
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A different oxidation state means a different electronic arrangement, so compounds of the same element can have different chemical properties.