Atomic Definition and 853 Threads

1. If we have sixty atomic nucleus that decay under ten days. How can we figure out their half life, their activity and a function? This graph shows how they decay: http://imgur.com/OSUB2P4 x axis illustrates times given in day, y-axis illustrates number of atomic nucleus decay2. No equations...

I believe this question will be a no-brainer for many members. I want to conceptually grasp how do atoms (and molecules) behave using QM in contrast to the classical physics model. Now there's uncertainty principle and atoms don't have a fixed position and momentum, and that's fine, I know it's...

Does atom really looks and behaves like as that explained in quantum mechanical model? Or is it just a Mathematical Tool to express the observations? Is it like that that scientist were unable to find any clue about real atomic structure and just created a mathematical tools following the...

My teacher was not too clear about this and from what I've gathered is if you're given two elements this is how you would figure out which one has a larger atomic radius or ionization energy, but I'm not sure if it's accurate Radius: Whichever one is in a lower period (more energy levels) has a...

Homework Statement What is the difference between amu and u? In my book they seem to use u but on my online homework it uses u and it seems to be the same thing. Homework Equations chemistry has too many special units The Attempt at a Solution atomic mass unit 1/12 mass of an atom of carbon...

Homework Statement For my project I need to compute the average the number of photons given by the expression: ##\bar{n}= \frac{e^{-\bar{h}\omega/\kappa T}}{1-e^{-\bar{h} \omega / \kappa T}}## where ##\kappa## is the Boltzmann constant and ##\omega## is the oscillator frequency. For the...

Before I got into physics, I thought that ##e=mc^2## was the atomic bomb equation. I now know that the equation itself has nothing to do with the atomic bomb. So, I'm wondering, how did ##e=mc^2## contribute to the development of nuclear/atomic weaponry/power? Edit: I do not know if this is in...

let's look at force at the atomic level to understand the Newtons third law of motion. I'll use Helium atoms as an example. Now imagine we start with one atom HE2 stationary, and throw another atom HE1 at it.It is the velocity of HE1 that affects the motion of HE2 , because the system of these...

I'm writing a piece of fiction that, if my understanding of the subject is correct, will include a bit of chemistry knowledge. (In explaining my question, I'm going to spell out some obvious things. I'm terrible at math, and hence even worse at chemistry) For example: Atomic weight is...

I'm writing a paper for my teacher, not an assignment, just because I was interested in the topic. I've searched a lot of websites, but most only talk about fusing two atoms, and not saying if it is possible to fuse more than two at the same time.

Hi, everyone! I was thinking about atomic absorption/emission of photons and how they all have specific locations in the frequency zones as "lines" of missing/peak emissions. I'm curious if there is a scientifically proven/hypothesis of how the physical oscillation of atoms in molecules due to...

Homework Statement According to Maxwells laws of electromagnetism: If an electron spirals into the nucleus: 1. what would happen to the electron’s orbital frequency? 2. what would happen to the frequency of the emitted radiation? and 3. what kind of spectrum would be produced—a continuous or...

"To visualize the standing waves (or orbitals) of electrons bound to a positively charged nucleus in three dimensions, we will need a four-dimensional plot of the wave function vs. x, y, and z." http://www.grandinetti.org/electron-orbital-shapes"The wavefunctions in the N=2 family are vectors in...

At any instant in time, for an atomic particle, are its characteristics singular?

In an electron system (spin =1/2, l = 1) the total angular momentum will be J=S+L

Hi. I am wondering about this. I have been able to find many graphs showing what the atomic orbitals look like for hydrogen, but nothing for more complex atoms, like helium. Why is this? Now I know the Schrodinger equation for helium cannot be solved exactly, but you don't need an exact...

At the LHC, particles are accelerated at near light speed to produce heavier particles in the collision E=mc2. Are the resulting particles in the collision produce the same fundamental atomic particles (electron, neutron, proton). What are the the chances of producing the same elementary...

klotza submitted a new PF Insights post Atomic Positioning with DNA Hinges Continue reading the Original PF Insights Post.

What cause the atomic orbitals electron configuration ? Thanks in advance

I keep seeing that "An atomic orbital is a mathematical function that describes the wave-like behaviour of either one electron or a pair of electrons in an atom" or something similar. However I can't find what the mathematical function is. Can someone tell me or link me to it please?

First This is not a nuclear question... and I am not a physicist ... My question concerns the age of ALL atoms in the universe... From the big bang to now we are talking 15-16 BILLION years?... And looking at the galaxies and how many light years they are away from us, we (our atoms) are all...

I got cornered in a discussion on the internet... I am not sure if I am right or not (I thought I was when I started). If you guys here tell me I am wrong, I have no problem admitting if I am indeed wrong first... person 2 said "Refraction =/= reflection. The atmosphere is colorless because...

Homework Statement If we take the average radius of the electron wave function in the ground state of hydrogen to be the Bohr radius, calculate the average potential energy of the electron due to the Coulomb interaction with the nucleus. State answer in eV. Homework Equations I think the...

Homework Statement "Calcium crystallizes in a body-centered cubic structure. (a) How many Ca atoms are contained in each unit cell? (b) How many nearest neighbors does each Ca atom possess? (c) Estimate the length of the unit cell edge, a, from the atomic radius of calcium (1.97A). (d) Estimate...

Is it made of quartz or stainless steel/aluminum or what? Does it matter which?that's all I need to know, I just can't seem to find if they can be made of standard vacuum metals or if they have to be quartz. Only really seen some diagrams mention quartz tubes but the pictures of large ones seem...

What does 'high spin' mean? I have heard of mono atomic gold having unusual properties. What is going on inside the atom?

Hi all, I'm trying to understand how to calculate the time dependent expectation value of the atomic dipole moment for a superposition state, and I have a good guess to check with you. Say we have \psi = \frac{1}{\sqrt{2}} \left[ \psi _{100} + \psi _{310} \right] at t = 0. Then, for t > 0: \Psi...

Simpel question: does an atom consists of matter and charge? Yes/no?? If no Then what?

I'd like to understand if non-atomic life forms are possible. For example, purely electrical ones. I'm not talking about those electron eating bacterias, they are still made out of atoms. Is there a possibility to form a stable structure out of electrons, or photons? Not necessarily in a vacuum...

Is there a mapping of macroscopic properties of a substance and its atomic properties? We know that colour is associated with the electron shells. What about other properties of matter like mercury liquid at room temp vs gold its neighbour on the chart a solid? Is there a mapping like...

I am a rising senior at a small liberal arts college, with an incredibly small (and therefore unrecognized) physics program. I am seeking advice regarding which Ph.D programs are within my reach. I plan on applying to AMO (Atomic, Molecular, and Optics) Ph.D programs with the intention of...

hello is there a software that simulates electromagnetic field around atoms, materials? to simulate the forces that drive chemical reactions? thanks!

Does atomic fluorescence involve: 1. spontaneous emission (or only), 2. stimulated emission (or only) 3. change in magnetic quantum number $$\Delta m \neq 0$$ ? Thank you. Rarely can I find a definition on the internet. My guess is that atomic fluorescence involves spontaneous emission only...

Hi I'm converting some numbers to atomic units, and it's important that I get it right. Would be happy if someone could reassure me. I want to convert the units of an electric field measured in kV/cm to atomic units. Here is what I got: \frac{kV}{cm}=\frac{10^3}{10^{-2}}\frac{J}{C\cdot...

What does trigger the phenomenon of an atomic electron losing energy through the issue of a photon? (I know how an atomic electron absorbs light and changes to a more energetic level but I never read an explanation cause-effect of the inverse)

Homework Statement so my friend asked this question: "what's the atomic radius ratio between He-3 and He-4?" 2. Homework Equations all i know is this equation : r =nh/mv 3. The Attempt at a Solution i thought the ratio will be same because both He-3 and He-4 have only two electrons. Correct...

Homework Statement Ok, don't get angry with me. The original problem is from Solid State Physics but my problem is very well in "Introductory physics". Here is the problem: The chain consists of molecules, which has three atoms, each with mass ##M##. Spring constant between the atoms inside...

Yeah... I know many of you people might be laughing but still I don't understand how can we simply reach the conclusion that increasing temperature increases the atomic motion. Consider this : When we push something, it moves (don't over think about this one) when we apply torque on something...

In the same article which describes the accurate measurement of the Hydrogen 1s-2s transition at: 2 466 061 413 187 035 (10) Hz, CG Parthey also measures the frequency difference between Hydrogen and Deuterium which he gives as: 670 994 334 606(15) Hz. Assuming that the transition...

Homework Statement http://pastebin.com/aS3vTR2V Homework Equations N/A The Attempt at a Solution I'm confused about what I need to do for the BlobFinder constructor. Someone told me that I should “initialize the ArrayList blobs”, then “create a 2D array of booleans called marked, having the...

Atomic radii of Na is much bigger than of Cl yet the drawings in Chemistry books often depict Na atoms smaller than Cl. Is there a reason for that??

Hello, I am reading the volume 2 of the Feynman's Lectures on Physics, and something is bothering me when he calculates the dipole moment of a single atom induced by an extern field ...

Hello, I am reading the volume 2 of the Feynman's Lectures on Physics, and something is bothering me when he calculates the dipole moment of a single atom induced by an extern field ...

I asked a question here in the forum, in the topic "Many Worlds Interpretation", things do touch in atomic scale? and in the macro scale? what defines "touching" ? Some members answered me.. Rodrigo Cesar said: in this video: watch?v=P0TNJrTlbBQ Professor Philip Moriarty explains it perfectly...

Hello I have been trying to find out how the data for the atomic mass of different isotopes is processed. I am vaguely familiar with mass spectrometry and other techniques used for the measurements and I know that the experimental results are coordinated by the Atomic Mass Data Centre. I am...

Starting from the FRW metric (for simplicity flat space, radial direction only): $$ds^2=-c^2dt^2+a(t)^2dr^2$$ If we take dt=0 then the proper distance ds(t) between two spatially separated points at cosmological time t is given by: $$ds(t)=a(t)dr$$ Now at the present time t_0 we can define...

what is the best referece book to study atomic structure and electronic structure of atoms ?

Hi, does anyone help me please to convolute atomic data. On x-axis I have wavelength and on Y axis scattered intensity data. Thanks Kartik

Homework Statement (a) What shows the existence of shell structure? What are the other numbers? (b) Deduce the spin and parities. Homework EquationsThe Attempt at a Solution The shell model is given by: So for Li, 3 protons pair up with 3 neutrons, leaving an unpaired neutron in...

Are there any charts (information) concerning the elements and Atomic Electron Transition intervals? Does each element have a time it takes from absorption to the time of re-emission? Concerning Spectral Lines are the result of interaction between a quantum system (atoms) and a single photon...