4.3 Transition Elements
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4.3 Transition Elements I. The Metals in the Middle A. The Iron Triad (Period 4) - PowerPoint PPT Presentation


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4.3 Transition Elements I. The Metals in the Middle A. The Iron Triad (Period 4) 1. Iron, cobalt, nickel 2. Make good magnets 3. Used to make steel B. Uses of the Transition Elements 1. Tungsten – incandescent light bulbs 2. Mercury – Thermometers and barometers

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4.3 Transition Elements

I. The Metals in the Middle

A. The Iron Triad (Period 4)

1. Iron, cobalt, nickel

2. Make good magnets

3. Used to make steel

B. Uses of the Transition Elements

1. Tungsten – incandescent light bulbs

2. Mercury – Thermometers and barometers

3. Colors in paints and fireworks

4. Catalysts: make reactions occur quicker


II. Inner Transition Elements

A. Lanthanides

1. Soft metals

2. Though called “rare”, really aren’t that rare.

3. Used to make flint

B. Actinides

1. All radioactive

2. Nuclei decay into two more stable elements

3. Uranium: only actinide found naturally

4. Half-life is 4.5 billion years

5. Rest are synthetic elements

5. Plutonium used on nuclear reactors


C. Dentistry and Dental Materials

1. Been using amalgam for 150+ years for fillings

2. But it contains mercury!

3. Now use new composites

4. Metal wires used for braces to help pull teeth

into place


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