Metals Definition and 340 Threads

This seems like almost too much of an elementary question, but what properties of metals / insulators cause their bandgaps to differ?

The literature i have on the origins / need for an effective mass of electrons seems only to relate it to the explanation of heat capacity of metals but it seems like the concept has applications far beyond this. Can someone pls provide a more general summary of its derivation and applications...

has anyone mixed titanium,tunsten,carbonated steel,vanadium and chromium togeather to make a alloy

I need to know how to find the time required for metals such as steel and copper to reach a temperature of the environment in which it is placed, based on its mass and the initial starting temperature such as the room temperature. This is important for me because I am going to start up an...

Hi, In my chemistry report I have include metals that are extracted from Carbonate ores. I was unable to find any other than Zinc from my own research. I am aware of Limestone and Dolomite. But is Clacium extracted from these ores? Could somebody inform me of any metals that are extracted...

Homework Statement To determine the Fermi Energy for metals such as sodium, copper, gold, ect one needs the Electron Concentration per cubic meter. Homework Equations How is this number determined? The Attempt at a Solution My textbook does not give me this information and...

Hi all, I have a few odd questions. 1. Can electromagnetic fields influence electrons orbiting around a nucleus? 2. Would it be possible to squash an electron "cloud" into a ring or saucer shape by the application of magnetic fields (think of Saturn and its rings, Saturn = nucleus & rings =...

"Which metals tend to be stronger, those that form FCC or those that form BCC crystals? " This is the solution provided which doesn't make much sense to me: "You should look at APF and coordination number of each crystal system to base your answer" Is this even a valid question? Doesn't the...

where can i find third order elastic constants of metals such as bronze steel ? sincerely

Im having trouble finding information on google about how car suspensions are manufactured and what type of metals are used. I am curious in understanding what the benefits and drawbacks are to using different metals. For example how certain metals will react when they are under compression. Are...

http://www.treehugger.com/files/2006/04/peak_copper.php http://www.thenational.ae/article/20080807/FOREIGN/629722880/1013/ART&Profile=1013 Any truth to this, or is this debunkable?

Can radio waves propagate through the walls of a solid steel (1/2" wall thickness) box that completely encloses the RF transmitter? Do lower frequencies work better? Any insight would be great. I'm a newbie her, so please be gentle.

Have any studies been done on the elastic properties of two unlike metals? I have noted a difference in the sound frequency of different horseshoes. Specifically, what is the effect of a horseshoe of one frequency striking a stake of another? I also assume that the speed of the strike is...

Hello, Recently,I study about the slip systems of metals which regarding to the material science subject. For face centered cubic(FCC),it slip system is {111}<110>.Hence the number of slip systems is 12.The{111}is the family for (111), (-111), (1-11), (11-1),(sorry！-1 means a bar line on top...

Where do I search to find what, if any tests have been done to see if ingested chlorella would effect colbot in the body in the form of a joint replacement?

I was wondering if anyone knew of links to different websites that stated the coefficients of resistance for different metals. Mainly copper, and steel equipment. I am working in a mill and my supervisor asked me to find out these values. There is copper cable running as ground and...

Hi, I want to learn that do atoms or crystals dislocate in the plastic deformation of metals.

We done an experiment of tensile test where we used the testometric machine that pulls different kind of material (aluminium, PVC, steel, brass) and generated graph stress/strain and etc, now we come to these questions: 1. Explain why the plastics/ polymer has a lower modulus and strength...

What type of metal are typically in wires? I believe that usually wires are made out of copper. Are most wires made out of copper? Does the size of the wire usually determine what metal is in a wire? For instance, are larger wires typically composed of copper, while smaller wires are...

I am using water electrolysis, and I need some bolts to be the anode/cathodes and I don't want them to corrode. Before anyone asks I will not be adding salt so there will be no chlorine. Thanks!

Is there is a reason why the elements in that 'family' tend to be more satisfied with having their higher s orbitals half filled before their d orbitals and another thing, why is it that from Sc to Zn its size remains static (that is strange considering its Z eff is increasing)? There's also...

Homework Statement While taking photographs in Death Valley on a day when the temperature is 59.0°C, Bill Hiker finds that a certain voltage applied to a aluminum wire produces a current of 1.000 A. Bill then travels to Antarctica and applies the same voltage to the same wire. What current...

Hi all, I'm keen to find out more about electron ejection from metals. Eg multi-photon photoelectric effect and thermionic emission. I've come across a few texts (Kittel) which deal with them in a general sense but can anyone recommend a more detailed analysis? Some questions which I...

for an example, polycrystalline silver, its index is n=0.135 and k =3.999 at the wavelength of 633nm, what does the nk mean, is that telling us the wavelength in the silver equals 633/0.135 nm ? and how to calculate the refractive angle in the metal? Give a good explanation, please.

Is the free-electron model synonymous with Drude model? or is Drude model a special subset of the free-electron model? I have seen texts that refer to a "free-electron model" and do not mention Drude's name. and i have also seen texts use these two terms interchangeably. Sorry, i have no...

When individual atoms bond to form a metal lattice, the total energy decreases, but does the kinetic energy of the electrons increase or decrease? What about the potential energy? Does it increase due to pauli exclusion or decrease due to the decrease in distance between the ion and electron...

Basically my project is to present a method of removing Fe, Mn, Ca or Mg from water and then do an experiment on a sample of water with the heavy metal in it. I've been doing a lot of searching online so far, and most of what I have found does not relate. I need something that I can actually...

Edit: Just realized that maybe I should have posted this in a different forum... sorry about that. Basically my project is to present a method of removing Fe, Mn, Ca or Mg from water and then do an experiment on a sample of water with the heavy metal in it. I've been doing a lot of searching...

I have a question that my teacher can't answer. :( I get that with the electronic configurations for atoms, an s shell fills before a d shell but also empties before a d shell. Okay. So the last couple of subshells for iron are 4s2 3d6; Fe2+ would be 4s0 3d6 and Fe3+ would be 4s0 3d5...

How come both spring and rubber band are elastic whereas spring are contracted and rubber bands are stretched? I understand that elasticity of an object depends on it ability to reform from deform. I also get that spring works b/c of normal force(too much contraction...right?-being the reason...

If you have the primary and secondary coils of a transformer next to each other, then current will induce a voltage in the secondary coil, creating current flow. This question applies to motors as well. If I place a sheet of steel between the two coils, will I still induce a voltage? For...

[SOLVED] conductivity of metals Homework Statement http://www1.union.edu/newmanj/lasers/LaserTypes/conductionbands.gif I do not understand this picture. Why does the fact that the valence band for the metal (conductor) is half-filled imply that it has high conductivity?Homework Equations The...

Why don't metal objects such as a nail get charged by friction like the famous comb, plastic rod or glass rod - all insulators?

The resistivity arises because the electrons collide with atoms so they flow slower. The resistivity of different metals differ a lot. What determines the electrical resistivity of different metals? It is related to their structure? How?

Hi! I'm writing a lab report and have some questions that I can't find the answer of... I really hope that someone can help me. Homework Statement 1. First of... I'm having a small problem with writing an equation for Zn reacting with a HCl solution (only H+ should be in the equation). 2...

For an electrochemical cell containing two metals how do I figure out which one reduces and which one oxidizes using standard reduction potentials? Thank you very much for the help.

Hello! In my course of solid states physics we use the fermi-dirac statistics for a free electron gas in metals. The fermi wave length of the electrons is about 1 Angström. Now, the wavelength may be intepreted as something as a coherence range - the electron should forget about the state of...

I know that heat increases the velocity in which the atoms move with in a solid substance that leads to farther expansion, and cooling does the opposite. My question how ever is this: will an alloy or metallic substance (say Iron) crack or break via accelerated heating then rapid cooling...

Will Helium diffusion through stainless steel at 250 Deg C and approx 700 psi Delta P present any practical problem?

Is practical to employ fractional distillation methods on a mixture of two metallic elements with low BP - for example Hg and Zn? And no, I'm not trying to do this.

people say metels conduct electricety but if that's true how cum metal pilons don't zap people when grounded. also i have a trick stapler that zaps people how cum its not very painfull

"Sea" of electrons in metals Is it a "floating" sea of electrons in metals? meaning they are not restricted to a spot relative to the atoms, but they just "float" around as long as it's in the metal, and the charge is almost perfectly level throughout the metal. (I doubt it would be absolutly...

just a general interest thing for chemists. i was shown this youtube video the other day: http://youtube.com/watch?v=gRuoWkOlaHM it is the show Brainiac and they are demonstrating Alkaline Metals reacting with water. They show brief Lithium, Sodium and Potassium reactions; then drop 2g...

Is there any way to predict what crystal structure a pure metal element will be? It seems that the simple 'electron sea' idea does not explain a lot of things. Thanks -scott

A metal is not a good dielectric. A vacuum is a decent dielectric. There are much better dielectrics than a vacuum. A high dielectric constant, k, means the material exhibits good dielectric behaviour. A vacuum has k = 1, better dielectrics have k > 1. What is the dielectric constant of...

Homework Statement Having done an experiment measuring the intensity of light reflected from copper, lead, zinc and iron, i found that copper reflected the most light, then iron, then zinc, then lead. Now i have to explain it and I don't really know how to ! The Attempt at a Solution...

it is known that in metals the electric field is zero because there are free charges inside that rearranges in such a way that it cancels the external electric field. If the external electric field is large enough, so large that all the free charge inside cannot rearrange itself to cancel the...

I heard that it's good to put metals like steel in the soil in which the plants grow in. Is that true? How does it help the plant? Does it act like a source of minerals?

Hi. Was wondering if anyone knew where i could find a list of the metals and their specific heat capacities. All i have found is this one: http://www.engineeringtoolbox.com/specific-heat-metals-d_152.html but i would like one that deals with all the metals Thanks

Hello, I need to know the fundamental frequencies of the noble metals "silver, gold, platinum ... etc" .. thank you very much