Atomic Definition and 812 Threads

[b]1[ Now in the 2nd year of b.tech I, since was in class 9th not understanding how Bohr modified the earlier Rutherford atomic model.It is known to me that Rutherford atomic model was failed because it could not satisfy the electromegnetic principle,according to which an elecltron continue to...

Homework Statement Could a 56Fe nucleus fission spontaneously into 2 28Al nuclei? Explain, your answer should include some calculations, should be based on the curve of binding energy. Homework Equations B=(Zmh+Nmn-matom)*931.49 The Attempt at a Solution...

Homework Statement 1x10^6 sodium atoms are excited to the 3p state at t=0s. The lifetime of the 3p state is 17ns. a.how many of these atoms remain in the 3p state at t=10ns? b.how many photons have been emitted from t=0s to t=30ns? Homework Equations N=Noe^(-t/\tau) The Attempt...

Just wondering.

Each of the 24 GPS satellites holds four atomic clocks! Why four and not one or two? They are not cheap! Thanks

Atomic wieght... I know, or at least think the wieght of an atom is the number of neutrons...but what I want to know is what governs this number? Is it a gravitational force...I mean all this spinning going on...how can they be so small, so close together and not bump into each other?--what...

If a photon of wavelength 663nm is incident on a hydrogen atom in its fourth excited state(n=5),then A.the atom doesn't absorb the photon B.the atom absorbs the photon but is not ionized C.the atom absorbs the photon and is ionized,with the electron having zero kinetic energy after ionization...

Homework Statement Draw an LCAO representation of all of the bonding orbitals for C2H2O. Be sure to clearly state the hybridization of the two carbons and the oxygen in addition to drawing the orbital representation. Also show clearly what orbital any unshared pairs occupy. Homework Equations...

Homework Statement In a sample of one litre of carbon dioxide at STP an average of 5 disintegrations C -> N + e + v are observed per minute. Calculate the atomic fraction of C present if the mean lifetime of this nucleus is 8267 years. Homework Equations \tau = \omega-1 = 8267...

Atomic planes are defined as the reciprocal quantities 1/u' , 1/v' and 1/w' transformed to the smallest three integers (here the plane intersects the crystal lattice at the unit-cell axes u'a,v'b and w'c). My question is, why are reciprocal quantities used? This is something that has bugged...

I'm studying A2 (second year college) physics and I am supposed to be finding out about the size of an atom and how it was figured out but I'm having problems because of the fact that nobody seems to know. I realize it is different for each atom/ion but how could it be figured out? Maybe it's a...

Is there any problem book in atomic physics?

[FONT="Fixedsys"] [SIZE="3"] I am in sorts about Radioactivity, I would like to know what other force keeps sub atomic particles of an atom from coming apart? I realize that gravitational pull is not what holds the particles together, but is there a more dominant force that does so? Does...

What is the maximum atomic weight of a single atom (in theory)? Could there be an element with an atomic number greater than 150, somewhere in the universe? How is it possible?

I am an afficionado of all weaponry, and there is this question I have which has bugged me for a while. What, exactly, makes a Hydrogen bomb different from an atomic bomb? I realize that the explosive is Hydrogen as opposed to Uranium or Plutonium, but why is it more powerful?

Could anybody help me with this? The atomic radii of the transition metals show some anomaly in their atomic radii as compared to those elements in Group 1A-7A, which generally shows a decrease as one goes from left to right in a period. The atomic radii of the transition metals decrease as...

Homework Statement Homework Equations why there is no isotope of hydrogen with an atomic weight of four? The Attempt at a Solution i find that such an isotope would have an isotopic spin state of 1/2 |2-1> + 3/2 |1 -1> is there a reason for this state to not exist?

Hi Guys! *waves* Anyway, I was just wondering what conditions and in what state are atoms sufficiently isolated so that it gives rise to a line spectra. I thank you all for any help you provide in advance. Many thanks, Icetray

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...

Sodium, = 11, has the ground state configuration [Ne] 3s^1 and is a “one electron” atom. Magnesium, Z= 12, is a “two-electron” atom. Write down its ground state configuration and possible term values. i think i get the right answer but I am having a couple of issues: my answer: ground...

What is the physical process common to both the emissions of atomic x rays and nuclear gamma rays? is it photoelectric.. or the inverse.

why the universe is a bad model to describe the atomic world? sun=nucleus planets=atoms they orbits they spin like subatomic particles they have magneticfield I mean anything you get from the atomic world, you have it in the macro world.

Hello, I've been wondering about the velocity of hydrogen electrons. I've read that 242,000 m/s was the correct velocity, however, I thought electrons would travel at c. How does one calculate this number? Thanks in advance.

Homework Statement Three-energy levels atomic gas is confined in the thermostat and subjected to an external radiation field (w=e3-e1 ). Determine occupation probabilities of the energy levels and the conditions for a coherent spontaneous radiation. Homework Equations The Attempt...

If an atom with more protons have tighter electron orbitals than atoms with fewer protons, why doesn't the "atomic radius" decrease up the periodic table? Instead it increases, why is this?

Hi all, I'm looking at the ALD process for a uni project and could do with some clarification on a couple of points. Does anyone have any idea what the effect of non-uniform substrate heating would be? Would it harm the chemical bonding and cause ablation? I can't seem to find out from...

What is being discussed when frequency is used to describe atoms? Or maybe I should be thinking nuclear oscillations...In other words, the wave function of what?

Hi guys. I was wondering what are your thoughts on how the atomic bomb has made an impact in science?

To initiate fusion, it says that the nuclei of each atom need to come into contact. And these atoms therefore need to be fully ionised for this to occur. Does FULLY ionised mean that the atoms have lost ALL their electrons? thanks :)

Hi all, I have recently been listening to one of Professor Richard Wolfson's physics lectures, and a question has occurred about an aspect of general relativity; that time 'slows down' in strongly curved spacetime. In this particular lecture, he mentions an experiment done some years ago in a...

Hey just need help regarding a few questions. 1. Which is more stable, C 2s or C 2p? Why? Choose the best answers from below: (a)higher shielding (b) lower shielding (c) lower n value (d) lower l value 2. Which is more stable, Ar 5p or Ar+ 5p? Why? Choose the best answers from below: (a)higher...

Hello, can someone explain how a line spectrum works. How do they provide evidence of energy levels in atoms? I would have thought that energy levels are to do with a different concept of Bands (Valence, Conduction) so how does a line spectrum provide evidence? :confused:

Can someone explain to me why different terms arising from a particular electron configuration have different energies? For example, for carbon in the configuration 1s^22s^22p^2 three terms arise, 3P 1D and 1S. These three terms have different energies but I don't understand why. The electron...

Please explain the phenomena of reflection at atomic level ? We know that on reflection a phase change of pi occurs i/e phase difference b/w reflected & incident beam is pi , explain this phase change of pi at atomic level ? What is actually meant by phase change atomic level ?

Homework Statement a)what property of graphite is the result of the presence of delocalized electrons? b)what is the reason for the generally low melting point of group I A metals as compared with the high melting points of metals in the center of the transition series? The Attempt at...

Dear experts - I'm writing a novel in my spare time, and would appreciate some help with a little bit of research. Some of the story is set in the distant future, where super strong materials are available. My problem is that I don’t know how to describe these super materials. I want to...

Homework Statement Find all possible values of L, Lz, and θ for an electron in a 3d state of hydrogen. I confuse it long time.. explain me please..

how can you explain atomic nuclei. liquid, charged, solid what? and there are some words about nuclear radius rn, rp and rc. what is the meaning of these words. all these data are experimental results or calculated. one is "atomic data and nuclear data tables, vol 71, no. 1, 1999, G.A. Salazar...

First I'm not a native English speaker so sorry for grammar errors . Ok let's start my hobby is to learn things and I tried to study relativity while I where reading some example of time dilation in atomic clocks. However I remembered something the speed of a electromagnetic wave is equal to...

May someone please explain what were some problems with the Bohr model of the atom. I found a few things on Wikipedia, but I being a beginner in the Physics curriculum do not fully understand how it all ties together. If there is a link to this topic in the forums, please do tell. Thanks.

Hello I didn't get something about the AO. i.e the electron configuration of C is 1s² 2s² 2p² . So we know that at the 2nd shell this has 4 electrons, 2 in s orbital + 2 in the p, right? How do we find out how the 2 electrons of p are spread in the px, py, pz? Thank you, Panos

for n=2 & l=1 we have P orbital for which magnetic quantum no. can take values -1,0,1 , now in p orbital we have 2Px, 2Py &2Pz each corresponding to vale of m like 2Px for m=-1 and so on , is this correct or 2Px can be represented by 0 0r 1 also .

1. Determine all terms in the configuration 4s^2 4p 4d in neutral germanium The answear is Singlett P,D and F Tripplett P,D and F But I don't really understand what singlett and tripplett means, and how do I know which tearms there are?

Is there a formula that can be used to find the half life of an atom? If so, what is it?

1 u = 1/12 of the mass of a neutral carbon atom with nuclear charge 6 and mass number 12, 1 u = 1/12 * 12.000000 /NA * 0.001 where NA is avogadro's number. I wonder is it that the scientists purposely make one mole of carbon-12 to be just 12.00000g? I want to ask is it when the...

I am doing some research on atomic clocks. From what I have read, I understand that in Rb atomic clocks you: -optically pump a cell of Rb, so that the electrons are all in a single hyperfine state -subject the cell to microwaves of appropriate frequency, so that the electrons will be...

A nuclear warhead for example doesn't seem to take a lot of energy to make, however it outputs massive amounts of energy in an instant. Why isn't this more energy out than in and why doesn't it break the law of conservation of energy? I think the answer is going to have something to do with...

Homework Statement Suppose that a human head is a sphere with the bone thickness 10% of the radius of the head. Find the fraction of the volume of the head occupied by the brain. Make a similar estimate (forget about factors of pi) in the N-dimensional space (d = N) in the limit N ->...

my question is : How would you make a 1, 3, 5, 7ppm solution from a 100ppm solution? do i just just this formula: C1V1 = C2V2 to calculate the amount i need? for example, for 5ppm solution => (5ppm) V1 = (100ppm)V2 so for V1, I just choose my final volume to be whatever i like... like...

all says electrons rounds the nucleus and revolves in its own axis if so in which direction electrons rounds the nucleus?