2 Chapter 6 â¢ organising elements Organising elements

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Transition metals The transition metals are found in a large block of the periodic table that consists of the ten groups across the centre (groups 3–12). Many have special properties that are not shown by group 1 or 2 metals: • A small number are magnetic. • The transition metals gold and copper are the only metals that are not silvery in colour. Fig 6.14 Xxxx.
14 • Many of the transition metals form coloured compounds. • Many of the transition metals form more than one compound with a non-metal like chlorine. For example, iron forms FeCl 2 and FeCl 3 . Fig 6.16 Xxxx. Fig 6.17 Boron and silicon are combined to form borosilicate glassware, such as the common Pyrex brand. This glassware is tough and has excellent heat conduction properties that make it suitable for cooking. Chapter 6 • organising elements Metalloids 1 What proportion of the periodic table is comprised of metals? 2 What properties are shared by all metallic elements? 3 Only one of the metals is not a solid. Which element is this and in what state does it occur naturally? 4 Design a way to represent the different groups of metals in a clear and informative way, identifying the distinguishing properties of each group. Fig 6.15 Xxxx. Metalloids are the small set of elements along the ‘staircase’ diagonal boundary between the metals and non-metals. As might be expected from this location, metalloids exhibit properties between those of metals and non-metals. Most of their properties would be considered un-metallic; however, metalloids conduct electricity like the metals. Three of the metalloids are semiconductors, which means that they only conduct electricity in a certain way under certain conditions. Fig 6.18 Silicon and germanium are widely used in electronic devices because of their semiconductor properties—they conduct electricity in a very controlled way. What do you know about grouping elements? 5 Name two properties shown by some transition metals that are not shown by group 1 or 2 metals. 6 Why could the term ‘metal-like elements’ be used to describe ‘metalloid’ elements? Suggest a better name for this group of elements. Explain your answer. UNCORRECTED PAGE PROOFS CAS_SB10_TXT_06_1pp.indd 14 11/11/11 4:58 PM
Page 1 and 2: 2 6 Chapter 6 • organising eleme
Page 3 and 4: 6.1 4 Why do we organise elements?
Page 5 and 6: 6 Some properties of Dobereiner’s
Page 7 and 8: 8 1894 William Ramsay, a Scottish c
Page 9 and 10: 10 Properties and structure 6.1 F
Page 11: 12 Grouping elements The two main t
Page 15 and 16: 16 What do you know about non-metal
Page 17 and 18: 6.3 18 How are properties linked to
Page 19 and 20: 20 Emission spectrum and electron s
Page 21 and 22: 22 EXPERIMENT 6.2 Conductivity of i
Page 23 and 24: SKILLS LAB 24 Ionic compounds Ionic
Page 25 and 26: 26 Table 6.6 gives the electrical c
Page 27 and 28: 28 Properties and structure 6.3 Ho
Page 29 and 30: 30 >>ZOOMING OUT
Page 31 and 32: 6 Properties and structure Element
Page 33 and 34: 34 Given the fact that so many coun

2 Chapter 6 â¢ organising elements Organising elements

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2 Chapter 6 â¢ organising elements Organising elements