GCSE Chemistry (AQA)

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Transition Elements: Ions & Compounds

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Atomic structure and the periodic table Properties of transition metals

Transition Elements: Ions & Compounds

3:46 Transition Element Properties and Compounds
Spec 4.1.3.2
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  • Transition elements can form ions with different charges.
  • Common transition metals typically form at least two ions, usually a 2+ and a 3+ charge.
  • Nickel and copper can form 1+ and 2+ ions.
  • Manganese can form up to five different ions, with charges up to 7+.
  • Memorizing specific ion charges is not necessary for exams, but understanding the general property is important.
  • Transition elements are named for their ability to transition between different charges.
  • Chromium ions, for example, can transition between CR 2+ and CR 3+ by losing or gaining an electron.
  • In compounds, ion charges are indicated with Roman numerals in brackets after the metal name.
  • Transition metals form colored compounds, and the color depends on the ion's charge.
  • Examples include chromium, manganese, iron, cobalt, nickel, and copper.
  • The charge of the ion, not just the element, determines the compound's color.
  • Transition metals are used as catalysts, such as in catalytic converters in cars.
  • Catalytic converters contain rhodium, a transition metal, to reduce polluting gases.
  • They convert harmful gases like carbon monoxide into less harmful gases like carbon dioxide.

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