cm23 - The Transition Metals, the Lanthanides and the...

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The Transition Metals, the Lanthanides and the Antinides
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The Metals in the Middle Groups 3-12 are called the transition elements. All of them are metals. Transition Elements 3 Across any period from Group 3 through 12, the properties of the elements change less noticeably than they do across a period of representative elements. Most transition elements are found combined with other elements in ores.
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The Iron Triad Transition Elements 3 These elements, among others, have magnetic properties. Three elements in period 4—iron, cobalt, and nickel—have such similar properties that they are known as the iron triad.
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The Iron Triad Industrial magnets are made from an alloy of nickel, cobalt, and aluminum. Transition Elements 3 Nickel is used in batteries along with cadmium. Iron is a necessary part of hemoglobin, the substance that transports oxygen in the blood. Iron also is mixed with other metals and with carbon to create a variety of steels with different properties.
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Uses of Transition Elements Most transition metals have higher melting points than the representative elements. Transition Elements 3 The filaments of lightbulbs are made of tungsten, element 74.
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Uses of Transition Elements Transition Elements 3 Tungsten has the highest melting point of any metal (3,410°C) and will not melt when a current passes through it.
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This document was uploaded on 02/06/2011.

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cm23 - The Transition Metals, the Lanthanides and the...

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