What you’ll learn2 learning objectivesChoose one objective for a focused lesson, or study the complete topic.8.4.1Transition elements as metals that• Describe transition elements as metals that: (a) have high densities (b) have high melting points (c) form coloured compounds (d) often act as catalysts as elements and in compoundsSyllabus objective8.4.2Transition elements as having ions• Describe transition elements as having ions with variable oxidation numbers, including iron(II) and iron(III)Syllabus objective