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Chemistry 20- Melting points
Janelle asked why tungsten was used to the filament of the light bulbs instead of copper. Here are the explanations to it.Basic Information about tungsten:
Name: Tungsten Symbol: W Atomic Number: 74 Atomic Mass: 183.84 amu Melting Point: 3410.0 °C (3683.15 K, 6170.0 °F) Boiling Point: 5660.0 °C (5933.15 K, 10220.0 °F) Number of Protons/Electrons: 74 Number of Neutrons: 110 Classification: Transition Metal Crystal Structure: Cubic Density @ 293 K: 19.3 g/cm3 Color: Silver Basic Information about Copper:
Name: Copper Symbol: Cu Atomic Number: 29 Atomic Mass: 63.546 amu Melting Point: 1083.0 °C (1356.15 K, 1981.4 °F) Boiling Point: 2567.0 °C (2840.15 K, 4652.6 °F) Number of Protons/Electrons: 29 Number of Neutrons: 35 Classification: Transition Metal Crystal Structure: Cubic Density @ 293 K: 8.96 g/cm3 Color: red/orange Reason: The reasons why tungsten is chosen is obviously due to the fact that tungsten, has a much more higher melting point than the copper. As the light bulb gives of light, heat will be given off too. Hence, the tungsten will not melt as soon as the copper, giving a longer lasting period. Therefore, tungsten is used. |
