Classical free electron theory was proposed by Drude .According to this there are some merits
1)It varifies ohm's law
2)It explains the electrical and thermal conductivities of metals.
3)It derives Weid man-franz law.
$)it explains optical properties of metal.
Demerits:-
1)The phenomena such as photoelectric effect,compton effect and the black body radiation could not be explained.
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Thermometers
Advantages of ferrous metals include their high strength, durability, and magnetic properties. However, disadvantages may include susceptibility to corrosion, heavier weight compared to non-ferrous metals, and limited formability.
It covers and protects woods and metals from the elements. It also adds colour.
Advantages of ferrous metals High strength to weight ratio compared to Non-metals Heavier than Aluminum and Titanium Alloys High quality and durable material Prone to corrosion by rusting (except stainless steel) Machine-ability Affected by magnetic field Recyclable and environmentally friendly Disadvantages of ferrous metals Requires more energy to form into shapes or re-work compared to Aluminum Alloys
Disadvantages- may be more expensive and not as strong as ferrous metals.Advantages- may be a better electrical conductor, not affected by magnetism, may be corrosion resistant.
Classical free electron theory is modeled by drude - Lorentz to explian elctrical conductivity in metals. According to this free electron in a metal (valence electron) move randdomly at room temperature and these free electron are drifted in opposite to the direection of the applied electric field. This is repsonsible for the conduction. Here all the free elctron are are considered as equal in all aspect.
Advantages Can be used to weld almost any metal as well as dissimilar metals. Gives very good quality welds (structurally and appearance) No slag involved Disadvantages Slow requires high skill to master
Alkali metals have one valence electron.
It's strong enough, light enough and cheap enough. Iron-based metals might rust, and it costs a fair bit in energy and pollution to produce metals.
Highly reactive metals with one valence electron are known as Alkali metals.
Highly reactive metals with one valence electron are known as Alkali metals.
Alkaline metals