Atomic Definition and 853 Threads

Hi everyone I missed some content in my lecture about atomic structure of atoms. In the lecture, the lecturer talked something about "slipping" , "easy directions" and "slip systems"...I don't really catch these stuff in this lecture. But I could find these in textbook. What makes me most...

I need help with these 3 questions: 1. Describe the Bohr model of the atom. How does it differ from a planetary model based on classical physics? ======================== 2. In terms of the Bohr theory why is that electrons don't spiral into the nucleus? ======================== 3. If...

Can anyone here use Bohr's analysis of the hydrogen atom, to compute the characteristic impedance of the vacuum? And if not, then how would the Bohr model need to be modified, in order to obtain Z0? Characteristic impedance of the vacuum = Z_0 = 376.730 313 461 ohms CODATA value...

i was given this task - find at least 2 cities which have a monument of atomic structure and give the name of the element of which the structure is. :confused: for example, there's an atomic structure of iron in Brussels named Atomium http://www.trabel.com/brussel/Brussel-HeyselAtomium.htm...

hi everyone, im trying to find the atomic radius of an Al atom using a few measurements i have. i had a piece of aluminum foil its measurements were [ 10cm*9.9cm*0.0014cm ]. The mass of the aluminum foil was 0.40 grams. Is there any possible way i can find the radius of an Al atom? I know i...

urgent question: localised mode, localisation effect of linear atomic chain Hello everyone, it is great place you have here, hope I can learn a lot from you I am doing some readings and there are couple of concepts that I haven't been familiar with and if you spend a little time to help me...

Does anybody know which are the comp-onents of the "atomic bomb" Thank-you for your help...

Describe briefly one piece of evidence for each of the following statements. i) Atomic radii are about 10^-10m ii) Nuclear radii are about 10^-14m Each part is worth 4 marks, so I would really appreciate if someone could reply with some slightly easy to understand, but quite detailed...

I need a plain & simple explanation of atomic structure. For example, if I was to consider the n = 6 shell, what would be the largest angular momentum quantum number and how many electrons can be put in this shell? Thanks for your insight!

could someone explain fire on the atomic level? in six easy pieces it says heat is usually in the form of molecular motion but sometimes it can be so enormous that it generates light. but how? can the motion of these molecules form other types of electromagnetic radiation (secondary question)?

Okay, here's the problem: For my freshman chem class we need to know which of Dalton's 4 atomic theories were disproven. There are two of them. I can't figure out which ones. Also, we need to know why they are wrong. I need this by tonight. Someone please help me! :bugeye: Thank you...

Gravity or gravitational fields are not yet understood fully. All mass bodies including the atom itself has what is called a gravitational field. Gravity is principly the partial alignment of the atomic electrical fields due to a common high velocity motion of the atoms through the universe...

which one is more important in determining the size of an atom? for example - Berilium has a smaller radius than Lithium because it has a greater core charge, but what about Nitrogen vs Berilium? Nitrogen has a greater core charge, but it has electrons in the 2p subshell whereas Berilium only...

First, hi. This is my first post, and after careful perusing of the forum I *think* this post is in the correct place. Feel free to move it around if not, apologies. The meat of my questions. I'm a High School student that would like to simulate atoms on the computer. I've been getting...

How would I go about finding the APF for a simple hexagonal unit cell. Which is a rectangle. I know one length is a0(HCP) but I cannot figure out the other side of the rectangle. Also, wouldn't the height be the c?

relative atomic mass of an element ? A sample of neon was found to cotain 90.9% of 20Ne, 0.26% of 21Ne, & 8.8% of 22Ne, Calculate the relative atomic mass of neon. this is what i'v done so far (90.9x 20)+ (0.26x21)+(8.8x22)= 2017/? i don't know what to divide it by :confused: ? I'm not...

I am curious about microscopes, I know i could buy an optical one for around $200 $500, i am wondering about how hard it would be to build a microscope that sees at the atomic level? I imagine buing one is pricey. Is it within the budget and access of Average Joe to build a microscope that powerful?

Can somebody explain quantum tunneling to me? And the thing about why amplitudes when they are trapped, the energies must choose from a distinct set of values? And why when particles that are totally free to wander will have any energy that they like? Also, why in the atomic spectra, more...

Is there a formula for calculating the atomic or covalent radii of elements, isotopes or ions?

Hi, I've been trying to figure these two questions out but they haven't beeen working. 1. A hydrogen atom is in its fifth excited state. The atom emits a 1090 nm wavelength photon. Determine the maximum possible orbital angular momentum of the electron after emission. Express your answer as...

Did they take an atomic clock on one of the Apollo missions for time dilation experiment if not why not ?

i am a person who just asks where the proof is about everything...so where is the proof of the Atomic Structure Theory? have we even seen an atom? have we seen a proton, electron, neutron, anything like that? don't even think of using the bubble chart/graph as an attmpt to prove anyhting with...

Homework--- Build Atomic Bomb What is the general output of enriched uranium from an electrolysis and fractional distillation process? I have already researched the outputs for gas diffusion, thermal diffusion, gas cenrifuge, laster isotope separation, and mass spectroscopy. If you could give...

Atomic Question-- bomb What is the general output of enriched uranium from an electrolysis and fractional distillation process? I have already researched the outputs for gas diffusion, thermal diffusion, gas cenrifuge, laster isotope separation, and mass spectroscopy. If you could give me any...

What is the general output of enriched uranium from an electrolysis and fractional distillation process? I have already researched the outputs for gas diffusion, thermal diffusion, gas cenrifuge, laster isotope separation, and mass spectroscopy. If you could give me any information on its...

i am having problems with the atom model part of physics, i know that the current model stats the electron location is a probability and all, its when i get to the wavelength and the energy, with all the ionization and the spectrums that i don't understand... how can i find the energy level...

Here's a verbatim section of the problem: " The source contains carbon isotopes of mass numbers 12, 13, 14 from a long-dead piece of a tree. (To estimate atomic masses, multiply by 1.67x10^-27kg). " My question is isn't the 12, 13, & 14 in the atomic mass units already (Carbon-12 has an amu...

Arranging atoms/ions based on atomic radius Hey, I'm in a bit of a bind here. I got a question that deals with atomic radius. The question asks to arrange the following atoms/ions in order from smallest to biggest: Cl, S^{2-}, K, K^{+}, O I know just by looking at the periodic table that...

I have a problem in my book, "Using the atomic theory of matter, explain why the resistance of a material should increase as its temperature increases". I can't think of one way that the two relate, but that could be because I don't fully understand what resistance is (on a molecular level)...

Okay, we have a graph that shows how v.high energy electrons are diffracted by atomic nuclei and the first minimum is shown to be at approximately 51 degrees for carbon-12 with energy 420MeV. To calculate the nuclear radii I decided to use sin(theta)= 1.22lambda/d and rearranged this so d was...

The Atomic Mass! Hello, I have a problem of getting the answer of this question and I still don't understand it. The question is What I though is that the answer is "1,700,000,000,000,000,000" and I thought it's same as when we say we have a red apple and how many red apples are in...

We all know that Maxwell did such a great work for all physicist. BUT, anyone knows that how Maxwell's theory of radiation could not explain atomic spectra?

Please help me with this calculation. I read that chapter in my book three times now and still don't know what actually do to calculate the atomic Rb-87/Sr-86 ratio of a rock sample containing Rb=125 microg/g and Sr=275 microg/g. Atomic weights: Rb=85.46, Sr=87.62 isotopic abundancy...

With your prodigious font of scientific knowledge, you are assigned the project of designing a series of unique materials from only three separate building blocks. Your constraints are as follow: 1. Make 92 different materials differing wildly in their physical and chemical properties...

Hi everyone. I've been searching google for a clear formula and formulas for atomic/nuclear bomb shockwave and blast radius. I haven't come across anything remotely close that details the effects of time on the effects of the bomb as it crosses a set distance. Can some one help me with the...

hey guys! I was just wondering if anyone could help me out a bit on this. I have the following radii (in angstroms...not that it really matters) Ca: 1.74 Ca 2+: .99 Zn: 1.31 Zn 2+: .74 Does anyone have any idea why the difference between the atomic radii of the two elements is...

Please, take a look on my atomic-model based on that a universe in which every point can be counted as an origo, must be a net. https://www.physicsforums.com/showthread.php?s=&threadid=8610 You can also read the rest of my theory on http://www.quantumnet-string.tk This explains the...

ive recently been reading about the string theory and of course learned that it is attempting to unify the forces. for a while now i have had an idea that its unlikely that matter could actually have multiple quantum forces and by eliminating two potentially unnessecary forces (weak and...

I have very little training in the area of Physics, but enough to understand most of what is said on this forum. This is a first time post. My question has to do with gravity on an atomic level. This question is for those of you familiar with trying to combine all four natural forces...

I have very little training in the area of Physics, but enough to understand most of what is said on this forum. This is a first time post. My question has to do with gravity on an atomic level. This question is for those of you familiar with trying to combine all four natural forces...

Hello everyone I am new to PF actually this is my first thread. I am looking for the equation to see how far and how, the radiation from the Nuclear Blast using E=mc^2. Can anybody help? Please[?] Nicole

How is superfluidity studied in a BEC?

Which of the following atomic elements does not belong in the following list? Carbon, Neon, Silicon, Phosphorus, Iodine, Xenon

Please I need detailed information about the ionization of atomic hydrogen , quantum states , values of energies ... etc

does anyone know if the atomic particles (protons, neutrons, electrons) have a particular size/shape? perhaps the idea of them having a certain radius is an imaginary concept? i would love to hear a knowledgeable opinion!

I wrote this short article for my grandson concerning the formation of clouds at an atomic level. I would be interested in constructive criticism before I put it away until he gets older. If anyone is aware of websites or other sources of information concerning this subject, I would be...

dear reader, why are the protons embeded with the nutrons? does nutron get atrracted to protons?

[SOLVED] Atomic radii I need to know precisely how the average atomic radii are calculated or found? I would expect it to be on the average contents of an experimental sample with adjustment for differing percentages. This would mean that isotopes missing from the sample are not included in...

A pi meson has mass of 139MeV/c^2. what is this in atomic mass? HOw do i solve for this? what steps do I need to do, any examples you can give to help me with to solve? Dx :wink:

Apologies for raising this question again, but it has finally dawned on me that as the Tables of Elements give an average mass (i.e. for all isotopes of each element) as the Relative Atomic Mass for that element; then my question is - Is the figure quoted for Atomic Radii also an average...