Atomic Definition and 853 Threads

Homework Statement Calculate the rest mass of Deuterium nucleus. Homework Equations Is it correct to calculate its mass using hydrogen? i.e. 2*rest mass of hydrogen?.. The Attempt at a Solution As stated in textbook, the rest mass of deuterium = 3.34330*10^-27 kg If it is...

Homework Statement It commonly happens that the hyperfine structure in a transition is dominated by the contribution of an s-electron in one of the levels. What property of s-electrons could be responsible for this? A transition of this kind occurs at 494nm in singly ionised 133Cs between a...

Hi guys, Can someone explain The concept of ELASTICITY on an atomic level. To be clear can somebody please try and elaborate on how does a metal rod or bar or wire start to extend under the influence of an external load. What exactly happens on the interatomic level, say we...

How does the nucleas of an atom get energy?

Metalogic-- atomic components in common for truth-functional entailment I'm trying to prove, assuming \Gamma is a set of sentences of SL-CN which truth-functionally entails P, that ~(\Gamma is consistent & P is not truth-functionally true (ie entailed by the empty set) & \Gamma has no atomic...

Let us consider an atomic orbital, for example n=2, l=1, m=0 in Hydrogen. The probability plot is given in the figure attached. This picture can be obtained experimentally: via X-ray and elastic electron scattering. Each negative sub-cloud carries a fractional charge. Fortunately, we have...

The 1st ionization energy decreases from Be to B. This would suggest that the outermost electron is held more loosely in B. Also, considering the electron configurations of Be (1s2 2s2) and B (1s2 2s2 2p1) one would think that in B, the shielding effect of the 2s electrons on the p electron...

Homework Statement The two isotopes of antimony have masses 120.90 and 122.90, with a relative abundance of 57.25% and 42.75% respectively. Using these figures, distinguish clearly between atomic mass, isotopic mass, and mass number. Homework Equations The Attempt at a Solution...

All of my questions that follow revolve around the question of atomic geometry/structure as it relates to quantum mechanics. On every high resolution (1 angstrom, and a few less than 1 angstrom) TEM image I have seen, atoms appear as spheres. I then found a website that claims it has visualized...

how to determine the resolution power of it? has it got anything to do with correlation wavelength? just wondering how it is calculated?

Hi Iwant some inormation about atomic time.Can you help me?

Q: The actual mass of one atom of an unknown isotope is 2.18 x 10^-22g. Calculate the atomic mass of this isotope. `How do I calculate it? help =]

Q: An average dimension for the radius of an atom is 1.0 x 10^-8 cm, and the average radius of the nucleus is 1.0 x 10-^13 cm. Determine the ratio of atomic volume to nuclear volume. Assume that the atom is spherical. [V=4/3(pi)r^3] I already have the volume for both, but how can I determine...

Hi, I'm currently looking into reflectivity and emissivity of metals in sunlight. However, I can't quite grasp how the mechanisms of reflection and emission differ. Emission obviously occurs because an electron is exited by a photon and then is de-excited and emits photon or photons. However...

I was previously under the impression that an atomic electron in its lowest orbit has a larger wavelength than an electron in a higher atomic orbit. I read earlier today that lower orbiting electrons actually have smaller wavelengths. :confused: This seems backwards since electrons...

Calculate the polarizability "a(lpha)" of atomic hydrogen in terms of R Homework Statement A simplified model of a hydrogen atom is that the electron cloud is a sphere of radius R with uniform charge density and total charge -e (The actual charge density in the ground state is nonuniform)...

First question, is atomic packing factor as described in wiki the same as fill factor? If so, how does it relate to the conductivity? Does conductivity increase will the increase in atomic packing factor or fill factor? I don't understand the relationship between conductivity and fill...

My question concerns my understand of the mechanics of the absorption of Photons by the components of atoms. I will use a common real-world example to facilitate my understanding of the concept. 1. When a rock (for example) sits in the sunlight, the rock warms to the touch. I believe this...

I understand that electrons are found inside Atoms within specific orbitals, or quantized distances from the nucleus. There are a maximum number of electrons found within each orbit, etc. etc. I recently read that the reason for this quantized nature of orbitals has to do with the wave...

Can you think about relativity in terms of the motions of atoms as they are subject to intermolecular forces? Is time moving slower for the atom which is accelerating with respect to another? Or, would the macroscopic averaging negate the individual motion of the atoms? Or, is this a...

awesome! i guess it won't be long now before people will be able to do this with their iPhones: http://www.dailymail.co.uk/sciencetech/article-1209726/Single-molecule-million-times-smaller-grain-sand-pictured-time.html

I have only taken one very intro quantum mechanics class and the furthest we got was solving the Schrodinger equation for the Coulumb potential of the hydrogen atom. So we solved for the allowed energy levels and the wavefunction for the hydrogen atom. We also learned how using the...

Is spontaneous atomic disintegration possible under current knowledge? I mean hypothetically if we could isolate one hydrogen atom in a container how long it would be hydrogen atom? Thanks!

In special relativity the clock hands velocity is represented by: V = v0*(1-v2/c2)^1/2 then: What happen with electrons angular velocity in atomic structure? It may be the same?: V = v0*(1-v2/c2)^1/2 if this could be true what happen with matter?

Homework Statement Barium metal crystallizes in a body centered cubic lattice. The unit cell edge length is 502pm. Calculate the atomic radius of Ba. a) 251 pm b) 217 pm c) 177 pm d) 125 pm e) 63 pm Homework Equations Pythagorean Theorem The Attempt at a Solution A^2 + B^2...

I was thinking that as far as I know, an atomic clock, and a mechanical clock, or a tuning fork clock might be affected differently by gravitation and acceleration. Is there any experimental verification of this? I'm trying to figure out if atoms will decay faster and that is it. Or if...

Homework Statement Couple of questions State the De Broglie Wavelength for electrons with an energy of 50eV and the following is a picture is a diagram of the energy levels in Fe: http://www.freeimagehosting.net/image.php?eeddf8b465.jpg What is the energy required to ionise Fe in in...

Basically I have an (infinite) population of isolated atoms with a bunch of discrete energy levels available to them. I want to work out what the expected population of each of the states is at a given temperature. They're complex atoms (transition metals) and spin-orbit coupling combined...

Why in atom, ther r discrete energy level & not continous? and energy emitted, from atom is in quata only?please give me exat answer or a related websites. thanx in advance:redface:

U-235 is most suitable for bombardment by slow neutrons 'cause it becomes U-236,providing for a more balanced nucleus. So if the electron shells are arranged something like 2,4,8,16,32,18,8,2 the atomic number only changes, in this case, because of an additional neutron. Is this element in a...

For a project/idea I'm working on, I need to find the charge density of tap water. I've read that this can be determined by simply subtracting total protons minus total electrons. I've got a list of elements that are in the water, but I'm not 100% sure how to find the exact number of electrons...

Nanotechnology, is a study of the control of matter on an atomic and molecular scale right? I'm currently studying taking this course in my college and I'm wondering if Nanotechnology plays a part in researching cancer cells. Does Nanotechnology helps in treatment of cancer cells? If...

Homework Statement How exactly does connecting cells in series increase the voltage on the atomic scale? Does it speed up the electrons somehow? Explanations appreciated!

hi i m studing AAS(atomic absorption specvtroscopy) technique.using beer"s law i plot a graph bw absorbance and concentration.then how can i make the quantitative analysis of my sample?

IT IS A POLL! I would like to learn if you've ever heard of the positive charge atomic form-factor before my asking this question. The positive charge atomic form-factor fnn'(q) stands at the nucleus charge Z and describes the positive charge cloud in atoms for elastic scattering at large...

The pic, taken sometime in the 1950's shows my father handing members of the Atomic Energy Comission resistors. Standing next to my father is Dale Electronics founder George Risk. In the 50's the Atomic Energy Commission handled everything atomic, including bombs. My oldest brother...

i have one problem on atomic radius. i read (http://en.wikipedia.org/wiki/Atomic_radius) the artical and try to understand it but i don't found any formula for it. The problem is: if the lattice parameter of alpha iron is 286 pm (Pico meter),what is its atomic radius? here we have only one...

How fast does an atom vibrate in m/s. I have found how fast it vibrates in hz but I'm trying to convert that to speed. Thanx.

This post is simply to check through these problems I have attempted to see if I have understood the question properly and applied the correct physics to each senario. Thankyou in advance for looking through my work; 1. The simplest model of describe the rotations of a diatomic molecule is...

Homework Statement An unknown nucleus contains 71 neutrons and has twice the volume of the nickel http://www.webassign.net/www32/symImages/f/1/3dca243bf11d1adbce4ca198d1973f.gif nucleus. Identify the unknown nucleus. Homework Equations r = (1.2X10^-15)(A^(1/3)) V= (4/3)(pi)(r)^3...

I'm trying to clarify the terms "nuclear effect" and "atomic effect". Due to the synonymous use of nuclear and atomic in the English language, the two are often viewed as being the same (as they were when I was in school); however during my current research, I learned that there is a...

Could anyone tell me a good book on Atomic and Nuclear physics?

Why the rutherford atomic model can't explain the line spectra of the hydrogen atom?

Question, sorry if it already answered: See this link: http://www.wacklepedia.com/h/hy/hydrogen.html Question is, why is calculated atomic radius of hydrogen (53 pm) LARGER than calculated radius of helium (31 pm) ? How can a single proton have larger radius than helium which has two...

Hi! I am new here, and I am no professional physicist, but I love science and physics. I don’t claim to know much at all, but I hope to someday. Nor am I a math wiz, in fact, I struggle with it. With that said, I was wondering if a percentage of the reciprocal of the “Atomic volume” is...

unknown ellement called M reacts with Cl to make MCl 0.7718 gram of MCl reacts with AgNO_3 as a result we get 2.6091 gram of AgCl. what is the atomic mass of M ??

Are atomic clocks such as the NIST-F1 Cesium Fountain Atomic Clock http://tf.nist.gov/cesium/fountain.htm" sensitive to the ambient temperature Or do they keep very accurate time regardless of the ambient temperature?

Homework Statement Calculate the five (5) lowest energy levels for the hydrogen atom using Bohr's model. Homework Equations [tex]E_{n}= -2\xime^4 Z^2/h^2 n^2[\tex] = [tex]-(2.178\times10^18 J)Z^2/n^2[\tex] The Attempt at a Solution I get how to attempt it but how can there be...

I am trying to find a clear answer as to why elements' weights vary, when their makeup are of the same protons, electrons, and neutrons? For example, H = 1.0079 atomic weight, 1 proton + 1 electron Li = 6.941 atomic weight, 3 protons + 3 electrons + 4 neutrons If a neutron = 1 proton + 1...

Hi, I'm currently researching into the formation and history of atomic clocks. Quartz and crystal clocks can determine resonance frequency measurements to an order of 10^8, but using Ramsey fringes this can become more accurate. Could someone help me explain why Ramsey fringes are a far...