1. Metals Khalid Zubaidi 8A

2. Info In this PowerPoint presentation, I will list some deferent metals from different areas of the reactivity chart. I will describe the relation between the place on the scale of reactivity and the date of discovery. I think that the higher it is in the reactivity series, the later it would have been discovered, because a metal that does not react with anything else, such as Gold, would be found left alone in nature. However, a metal that does react with other elements, such as Potassium, would be combined with other elements and hence would be harder to find, considering the fact that it would have been combined with something.

3. Potassium Potassium was discovered in 1807 by Sir Humphrey Davy. It is the 8 th most abundant metal on Earth, and it comprises 2.1% of the Earth’s Crust. Uses: fertilizers, soaps, detergent, drain cleaners, glass, etc.

4. Aluminum Thoughts of an unknown metal in Alum, started in 1787, however no one knew how to extract it, until tiny lumps of it were extracted in 1825, by Hans Christian Oersted. Aluminum is the most abundant metal in Earth’s Crust. Aluminum is the most abundant metal in Earth’s Crust. Uses: cans, foils, kitchen utensils, parts of airplanes, rockets, etc. Mainly anything that requires strong but light material.

5. Zinc Archeological evidence suggests that zinc has been in use for 2500 years, however was officially discovered and known as an element in India in 1746 by Andreas Sijismund Marggraf. Uses: The main use is Galvanization, however it is used as alloy for many different metals such as brass

6. Copper Archeological evidence states that copper has been in use for 11,000 years. Pure copper is usually to soft to use, but people learned 5000 years ago that you can strengthen it by mixing it with other metals. Uses: Mainly used in the Electrical Industry, second in electrical conductance only to silver. Other uses, water pipes, jewelry, and for a period of time, the American penny, etc.

7. Silver Archaeological evidence suggests that people have been using silver for 5000 years. Pure silver is the best conductor of heat and electricity. It is also the best reflector of visible light. It also has been used to create different types of coins, silverware, and jewelry.

8. Gold Archeological evidence suggests that Gold has been in use for 5500 years. Gold is the most malleable and ductile of all known metals. Pure gold is usually soft and is alloyed with other metals. Uses: Gold is a good conductor of heat and electricity and does not tarnish when exposed to the air, so it is used to make electrical connecters. Other uses: jewelry, decorative items, dental fillings, and coins. Uses: Gold is a good conductor of heat and electricity and does not tarnish when exposed to the air, so it is used to make electrical connecters. Other uses: jewelry, decorative items, dental fillings, and coins.

9. I have found that what I have researched matched my hypothesis decently, bearing in mind that metals such as Silver and Gold were found very early in time, as for metals like Aluminum and Potassium, were found very lately.

10. Bibliography "Who Discovered the Elements?" Science Education at Jefferson Lab. Web. 23 Oct. 2011.. Digital image. Web. 23 Oct. 2011.. Digital image. Web. 24 Oct. 2011.. "File:Potassium-2.jpg." Wikipedia, the Free Encyclopedia. Web. 24 Oct. 2011.. "File:Zinc Fragment Sublimed and 1cm3 Cube.jpg." Wikipedia, the Free Encyclopedia. Web. 24 Oct. 2011. http://en.wikipedia.org/wiki/File:Zinc_fragment_sublimed_and_1cm3_cube.jpg> http://en.wikipedia.org/wiki/File:Zinc_fragment_sublimed_and_1cm3_cube.jpg "File:NatCopper.jpg." Wikipedia, the Free Encyclopedia. Web. 24 Oct. 2011. http://en.wikipedia.org/wiki/File:NatCopper.jpg. http://en.wikipedia.org/wiki/File:NatCopper.jpg "File:NatCopper.jpg." Wikipedia, the Free Encyclopedia. Web. 24 Oct. 2011. http://en.wikipedia.org/wiki/File:NatCopper.jpg http://en.wikipedia.org/wiki/File:NatCopper.jpg Web. 24 Oct. 2011.. "File:Gold-crystals.jpg." Wikipedia, the Free Encyclopedia. Web. 24 Oct. 2011...

11. Thank You