Transition Elements
Bayani Gaba-gaba
In the wide central block of the periodic table sit the transition elements, the familiar everyday metals such as iron, copper, nickel and chromium. They are the metals we build with, wire our homes with and shape into tools, and they bring a distinctive set of properties that set them apart from the reactive metals of Groups I and II.
In this lesson you will learn the characteristic properties of the transition elements: their high densities and melting points, their coloured compounds, their use as catalysts, and the way they form ions with more than one charge, such as iron(II) and iron(III).
Manufura
- Describe the 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 compounds.
- [Supplement] Describe transition elements as having ions with variable oxidation numbers, including iron(II) and iron(III).
Takardar Darasi
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- Which is a typical property of a transition element? A. Low melting point B. White compounds only C. High density D. Very reactive with water Answer: C
- Transition elements often act as: A. Insulators B. Catalysts C. Non-metals D. Noble gases Answer: B
- Which pair of ions shows the variable oxidation numbers of iron? A. Fe+ and Fe2+ B. Fe2+ and Fe3+ C. Fe3+ and Fe4+ D. Fe and Fe2+ Answer: B
- Compared with Group I metals, transition elements are: A. Softer and more reactive B. Harder and less reactive C. Lighter and more reactive D. Lower melting Answer: B
- Transition metal compounds are usually: A. Colourless B. White C. Coloured D. Gaseous Answer: C
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