Quantum number Definition and 81 Threads

What would be the best way to define electron shell? I know that it is identified by the principal quantum number, but not sure how to clearly define it.

Why is the s,p,d,.. nomenclature derived for the H atom also valid for many-electron atoms?

Homework Statement What is the value of the principal quantum number for a hydrogen atom to have a size of one micron?Homework Equations r=(5.3x10-11)(n2) r=1x10-6/2=5x10-7The Attempt at a Solution 5x10-7=(5.3x10-11)(n2) 97.1 = n How is this possible? lol Maybe it's more complicated then I'm...

Homework Statement What are the possible values for the magnetic quantum number ml for an electron whose orbital quantum number is l = 4? What are the allowed values of the angles between L and the zaxis in this case? Homework Equations The Attempt at a Solution Is Ml equal...

Homework Statement Is the following transition allowed? [4,3,0,1/2] -> [4,2,1, -1/2] If so, find the energy involved and whether the photon is absorbed or emitted for the hydrogen atom. Homework Equations Selection rules for allowed transitions: \Deltan = anything \Deltal =\pm1...

H2 has a moment of inertia equal to 4.603 x 10-48 kg m2. 1) Calculate its bond length. 2) For the first 3 rotational energy levels, find the a) l quantum number b) ml quantum number c) the degeneracy of each rotational level d) energy eigenvalues e) the magnitude of l Ok so I...

http://arxiv.org/abs/0909.3456 Antigravitation Sabine Hossenfelder (Submitted on 18 Sep 2009) We discuss why there are no negative gravitational sources in General Relativity and show that it is possible to extend the classical theory such that repulsive gravitational interaction occurs...

Homework Statement The hydrogen spectrum contains a blue line with a wavelength of 434 nm. Photons of blue light are emitted when hydrogens electron drops from the fifth energy level to a lover energy level. What is the lower energy level? Homework Equations En = 13.6 eV/n^2 E =...

as in Y^{m}_{l}, what is l and m mean in their spherical coordinate

Hello. I am in class eleventh. I met a class 12th guy telling me that he knew a theoretical proof for showing that the values of spin quantum number are +1/2 and -1/2. If anyone else knows the proof, please tell me...I'm desperate to know.. Any help would be appreciated.

Homework Statement Describe a possible set of quantum numbers for the 44th electron in mercury. The Attempt at a Solution I can't help but feel a bit embarrassed by some of the questions I ask on this forum. Nevertheless, I am having problems with figuring out what the magnetic...

My chemistry teacher gave us a question just to make us search that why is the Spin Quantum Number always + or - 1/2. I tried searching on the net, but i got different answers on different websites. Why exactly is it, why can't it be 1,2,3 or some other number.

hi folks, had a problem I couldn't do, though I made a valiant effort. perhaps you can tell me where I went wrong. Homework Statement All integer values of the principal quantum number n, even very large ones, are allowed in atoms. In practice, it is very hard to excite orbits that...

Homework Statement The problem is: find all possible quantum numbers for each electronic configure of carbon. 2. The attempt at a solution I don't quite understand what the question is asking. Does it ask first write down the electronic configuration and write down all quantum number...

Hi, I am new here. I am a graduate student of department of physics at some university in Korea. If there is any wrong in my english, I will apologize in advance. I am preparing for my qualifying exam that is going to be held on next month. Homework Statement The question is very simple as...

STATEMENT: A system is known to be in the normalized state described by the wave function \psi(\theta,\phi)=\frac{1}{\sqrt{30}}(5Y_4^3+Y_6^3-2Y_6^0) What is the probaility of finding the system in a state with azmithual orbital quantum number m=3?WHAT I HAVE: We know that...

lets say there is an electron configuraiton of 1s^2 2s^2 2p^2 3p^1 I want to find the total angular momentum quantum number, J=L+S considering the n=1 state, there are two electrons, in the s shell which means one is spin 1/2 and the other is spin -1/2 giving a total spin of 0. The s shell...

Being a student sometime i confuse about the real concept of magnetic quantum number. Somwhere i perceived when orbit is introduced in external magnetic field then magnetic quantum number.But there is still magnetic field due to electrons as well? I am confused about whole story? Can anyone...

[SOLVED] particle in a box Homework Statement An electron moves with a speed of v = 10^{-4}c inside a one-dimensional box of length 48.5nm. The potential is infinite elsewhere. What is the approximate quantum number of the electron? Homework Equations E_{n} =...

Hello! Can you help me a question? -The particle was describeb by 3 quantum number: n,l,m (not consider the spin). -But in Solid books, writer often use wave vector \vec{k} to describe state of particle. That is kx, ky and kz with 3 dimension of coordinate. Then, what relation with 3 quantum...

Homework Statement Why is the spin quantum number either +1/2 or -1/2 Homework Equations N.A. The Attempt at a Solution I am not sure but this is the way i thought of it. Whatevrr quantum numbers i have known of so far: Principal, Azumithal tc. all of them have a diffrence of...

Hello! Why is it the case, that the principle quantum number limits the values of the angular momentum quantum number like l <= n-1 How is it possible to derive this? Thank you for your answers.

If an operator commutes with the Hamiltonian, then, the eigenvalues are said to be good quantum numbers. For example, the helicity. But then, helicity is not an invariant for a massive particle. I can always go to another Lorentz frame such that the helicity is now reversed. How then, can it be...

Could someone please help me firgure out this homework problem? "What is the principal quantum number of the s and p valence electrons in sulfur and arsenic?"

I have a chart and I have to say if any of the sets are not valid: ------------------------ _____n__l__ml Set 1: 6 4 -4 Set 2: 1 0 -1 Set 3: 4 1 1 ----------------------- and my choices are: a) set 1 only b) set 2 only c) set...

For the pairs below, I need to name the orbital they describe... I just am checking that I am on the right track: a) n=5, l=0 >> 5s b) n=3, l=1 >> 3p c) n=4, l=2 >> 4d if those are not correct, can someone lead me in the right direction?

[URGENT]How to prove gluon has this quantum number assignment? From PDG booklet, for gluon, I^G(J^{PC}) = 0(1^-). My questions are: 1. How to prove its P=-1? 2. Why C parity and therefore G parity are not well-defined for a gluon? Is it because gluon have nothing to do with...

The larger n, the longer the orbitals, the higher the energy level, and the higher the speed of electrons?

Why is the spin quantum number given a value 1/2? Why not any other value, say +1 for clockwise spin and -1 for anticlockwise spin instead of +1/2 for clockwise spin and -1/2 for anticlockwise spin ?

a mass of 10^-6 grams is moving at a speed of 0.1 cm/s in a box 1 cm in length. Treating this as a 1-D infinite square well, i am to calculate the quantum number n: i was wondering if I am setting this up correct: \frac{1}{2} * 10^{-6 }g * 0.1 cm/s = \frac{n^2 \pi^2 \hbar ^2}{2*10^{-6 }g *...

was the principal quantum number proposed by Planck? i remember that Planck proposed quantization, n, but is that the same thing as the principal quantum number n? the principal quantum number represents the quantization of energy, right?