Atom Definition and 999 Threads

Ionization energy of the gold atom?? You have a cold gas of gold atoms, and you observe that if you shine light consisting of photons with energy 10.2 eV through the gas, some free electrons are observed, implying that a photon of this energy is able to ionize an atom in the gas. You find that...

Orbital Angular momentum quantum number of an electron in its ground state - s - state is zero, l = 0. That means in S - state atom do not have orbital angular momentum. If it is not, then is electron stop orbiting round the nucleus? How to explain this aspect? Or wether we have to abndon the...

The 1s radial function of the wave function of H atom is: R10=2 a-3/2e-r/a ,where a = 5.29*10-11 meter but substituting a with its value,we will get R10 = 5.2*1015 *e(-1.89036*1010 r) and that is impossible if r=a and R(r)=1.9*1015 where is the problem ? What's more, the unit...

I'm studying particle physics now and am confused with all these terminologies.

Homework Statement Order each of the following sets of five atoms and ions according to decreasing size. (i.e. "1" largest and "5" smallest) N, Br-, Cs, P, Mg2+ Homework Equations When an atom loses electrons (becomes more +), its size decreases. Conversely, when an atom gains...

The ground state electron configuration of Carbon atom is 1s^{2}2s^{2}2p^{2} For the electrons, 1s^{2}2s^{2}, L=0, S=0 So only consider electrons of 2p^{2}, and s_{1}=s_{2}=1/2 ---> S=0,1 l_{1}=l_{2}=1 ---> L=0,1,2 For S=0, L=0; J=0, so we have ^{1}S_{0} For S=0, L=1; J=1, so...

Homework Statement A Hydrogen atom is initially in its ground state and then subject to a pulsed electric field E(t)=E_{0}\delta(t) along the z direction. We neglect all fine-structure and hyperfine-structure corrections. Homework Equations 1. It is important to use selection rules to avoid...

think that all the mass of the atom are concentrate in nucleus and the shape of the nucleus is like a ball with radius =1.5*10^5. IF the mass of the carbon atom = 2.0*10^23. what is the density of the carbon atom? the volume of the planet Earth=4/3pie*r^3 i just want to say that...

Looking for ideas that allow me to create Methane ( CH4 ) from gaseous hydrogen. This requires bonding one carbon atom to four hydrogen atoms, which should be simple enough, but there needs to be a minimum explosive danger. I know there are appliances to go the other way, but don't have the...

Homework Statement What is the mean value of the momentum of an electron of a hydrogen atom in its ground state? Derive this mean value of the momentum from the kinetic energy of the electron. Homework Equations <p> = integral from -infinity to infinity (p*|psi|^2) dx p^2/2m = KE...

Briefly,the forces between two atoms arise from nuclear and electron-cloud repulsions, and nuclear to electron-cloud attraction. But why does the repulsion vary with respect to distance, without following the inverse square law? Should not electrostatic charges follow the inverse square law...

What happens to the atoms in a spring when the spring looses its elasticity in hookes law? I am aware of the hookes law F =-kx but for my assignment i am also to state what happens to the atoms when the spring becomes plastic and deforms how and why? my asumtion is that they atoms...

Homework Statement According to Bohr's atomic model, 1)Determine the allowed radius of the orbit of the electrons. Calculate the radius of the first orbit for the hydrogen atom. 2)Show that the energy of the electron is quantized. Calculate the energy corresponding to an electron on the first...

Are there any ionizing solutions for the hydrogen atom problem, where the electron breaks away from the proton?

Homework Statement 1 The density of copper is 8930 kg m-3, its mass number is 63.55 and its atomic number is 29. a) Calculate the mass of a copper atom in kg. b) How may electrons and protons does a copper atom have? c) Estimate the diameter of a copper atom...

Homework Statement For a hydrogen atom, if the energy of a state (excited or ground) is higher then the frequency of the light emitted when the atom decays is: Higher, independent of the excited state, lower, or not enough information Homework Equations E = hf = hcR(1/(n12 - n22)) The...

Homework Statement During my calculation of hydrogen atom perturbation, I need to integral below in cartesian coordinate. It is given that below integral can be transformed. Homework Equations Anyone could help to see what will the transformed integral in polar coordinate if the...

Homework Statement revered members, one limitation of bohr atom model is that it could not account for distribution and arrangement of electrons. i could not understand this statement, that is, according to bohr , electrons revolve around the nucleus in circular orbits and the necessary...

Homework Statement A hydrogen atom in the n = 2 state absorbs a photon with wavelength 380 nm. Q1. Find the change in the atom’s total energy. Q2. Find the change in the atom’s potential energy Q3. Find the change in the orbiting electron’s kinetic energy. Homework Equations...

Homework Statement The electrons of the uranium atom can be approximated as a uniform density sphere with radius 7.4 x 10-13 cm. The nucleus is a point at the center with a charge of +92e, and there are 92 electrons. a. Calculate the electric potential and electric field at the surface...

Homework Statement A hydrogen atom is in a state with energy -0.278 eV. Homework Equations L = nh' The Attempt at a Solution The answer book says to do E_n = (-13.6 eV)/n^2 but I can't find this equation in our book. Is the 13.6 a significant number or just a different number...

here are the problems that I need help with: http://imgur.com/a/fERMC/1 I am afraid that I know not much information about the questions. Sadly, I am enrolled in a poorly written Physics class online. I am not looking for the answers, but just how to go about finding them. The book never...

Homework Statement Substitute an electron in a neutral hydrogen atom with a muon. a) calculate the Bohr radius of the ground state for this myonic atom of atom. The answer must be right to at least 2 significant digits. b) Calculate the fraction of the myon that is located inside the proton...

Homework Statement Substitute an electron in a neutral hydrogen atom with a muon. a) calculate the Bohr radius of the ground state for this myonic atom of atom. The answer must be right to at least 2 significant digits. b) Calculate the fraction of the myon that is located inside the proton...

Hi guys, I need to write down the positions of all the atom in LaFeAsO unit cell: Figure caption: "The quaternary equiatomic ZrCuSiAs-type structure is very simple, with only eight atoms in the tetragonal cell. The dashed lines represent a unit cell." I also have these informations...

Homework Statement Calculate the expected value for r^2 for the 2s wavefunction of the hydrogen atom (only the radial part of the function is needed for l=0). If you choose to solve this problem graphically, plot or sketch the function you integrate. Homework Equations...

Hi! I am writting my labbraport on electronspektrum for natrium atom. Here is my electronic transitions but the teacher says that there are some transitions missing...have no clue which ones they might be...can someone explain to me what is he talking about? which are the missing electronical...

Does it have to do with the strong nuclear force holding the atoms together being released?

You see hydrogen electron energy states labeled as 1s1/2, 2s1/2, 2p1/2 and 2p3/2. My confussion may be with understanding the definitions, but does not the 2s1/2 state imply that there are 2 electrons around as the 1st s orbital is filled. But, by definition doesn't that mean you are dealing...

Homework Statement How do we know that matter consist of atom? Homework Equations The Attempt at a Solution

lets say i have a hydrogen atom and i shoot a photon at it but the photon does not have enough energy to kick the electron to the next energy level , does the electron absorb the photon and if it does what happens ?

Homework Statement Question 1 An alpha particle traveling at velocity u makes an oblique elastic collision with a helium atom moving with a velocity which is negligible compared to u. After the collision the alpha particle moves in the direction inclined at 30 degrees to its initial direction...

as we know when a particular energy is given to a neutral atom an electron from ground state jump to upper state (absorbing the energy). and that excited electron after sometime by releasing energy jump again to its ground state. my confusion is that firstly does this transition of electron...

Homework Statement Polonium has a simple cubic structure at room temperature. Given that the mass density of solid ^{209}_{84}Po is 9.2gcm^-3 , calculate the diameter. The Attempt at a Solution Volume = mass/density = 209/ 9.2 = 22.7 cm^3 1 mole = 6.02 x10^23 mol^-1 22.7 / 6.02x10^23 = 3.77...

Hi there! If I want to find the eigenstates of the hydrogen atom in QM I start with the hamiltonian of a free particle in a Coulomb potential. But an electron in a coulomb potential is stable in classical mechanics too! The instability of the system comes from the fact that the electron...

Homework Statement What energy (in eV) is required to remove the remaining electron from a singly ionized helium atom, He+ (Z = 2)? (a) 3.40 eV (c) 27.2 eV (e) 76.9 eV (b) 13.6 eV (d) 54.4 eV Homework Equations Ei - Ef = hf The Attempt at a Solution Ef: the 1st level Ei...

Homework Statement Diagram not to scale: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Energy (J) n = 3 ----------------------------------------… - 0.24x10^-16 n = 2 ----------------------------------------… - 0.54x10^-18 n = 1...

1. The problem statement A hydrogen atom has an electron in the fundamental state. a. Show that a radiation with λ = 50 nm will ionize the atom. b. What will be the excess kinetic energy of the electron in joules? What is this question asking? Is it asking what wavelength will free...

Homework Statement Find the wavelength of the radiation emitted when a hydrogen atom makes a transition from the n = 6 to the n = 3 state. Give answer in µm. Homework Equations z^2 / n^2 x 13.6ev delta E = E2 - E1 = hv The Attempt at a...

The system is at the state of Φ=aY_11+bY_20 (a^2+b^2=1),please find the possible eigenfunctions of Lx and the relevant possibilities? My solution: I have attempted to use the matrix mechanics to work out the exercise,but I should work out a 8-order matrix. Firstly I use the Fmn=〈m︳F|n〉to...

Once it was thought that electrons was orbiting nucleus almost like planet the Sun. But this could not be correct because then would the electron lose their energy and spiral into the core. My question is how such orbit energy lost can be calculated. This is not homework.

Homework Statement according to proust, all the elements are made up of atoms of hydrogen. what does this statement mean? does it mean that all elements have only onoe proton and one electron like hydrogen. i know this theory was discarded but i can't understand the statement. for example...

1. The most probable point a 1s electron will be found in the hydrogen atom is r = 0. 2. The most probable distance that a 1s electron will be found in the hydrogen atom is r = 0. 3. For a hydrogen atom with l (lower case L) = 0, Ψ is independent of the angles Θ and Φ. 4. For a hydrogen atom...

how do i make a hydrogen atom , if i shoot an electron by a proton will it start to orbit the proton , what dictates whether it will orbit or not .

Homework Statement A mass spectrometer yields the following data for a beam of doubly ionized atoms of a single element. B = 8.0*10^-2 T q = 2(1.60*10^-19 C) r = 0.077 m V = 156 V I am asked to solve for Mass (m) in kg. Homework Equations q/m=((2V)/((B^2)*(r^2))) I am only...

Homework Statement Comparing the hydrogen atom orbitals to an infinite square well. a.) For the hydrogen atom, what is the energy difference between the ground state and the next energy level? b.) Now 'tune' an infinite square well holding a single electron so that it has the same energy...

I am reading about this for the first time. The Kronig-Penny model seems to assume the electrons have already escaped their atom and starts out with free electrons between potentials, then proceeds to calculate the energy eigenstates. Did I miss something here? How do the electron's escape...

Dear all, ma questions is what is the relation between atom and the universe? Is universe an enlarge model of an atom? What are the similarities and dissimilarities between an atom and the universe? Is there any evidence of the existence of multiverse or meta-verse?

Homework Statement Consider a hydrogen atom whose wave function at time t=0 is the following superposition of normalised energy eigenfunctions: Ψ(r,t=0)=1/3 [2ϕ100(r) -2ϕ321(r) -ϕ430(r) ] What is the expectation value of the angular momentum squared? Homework Equations I know...

Homework Statement The following diagram represents the allowed electronic energy levels of a hypothetical atom. What frequency photon would be required to ionize this atom if it were already in the n = 2 state? [PLAIN]http://img32.imageshack.us/img32/667/picture2vt.png Homework...