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Questions tagged [atomic-structure]

For questions about the various atomic structure theories, including the Bohr theory. Not to be confused with the actual arrangement of atoms in macroscopic solids ([solid-state-chemistry]) or newer quantum concepts ([quantum-chemistry])

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29 views

When does a continuous and a line spectra occur? [on hold]

Its said that nuclear atomic model was rejected as according to it the electrons should radiate continuous spectra. But they radiate line spectra. My question is that line spectra is emitted when the ...
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1answer
49 views

Angular momentum of an electron in an atom

The Orbital Angular momentum of an electron in an atom is given by $\hbar \sqrt{l(l+1)}$ and the Spin Angular Momentum is $\hbar \sqrt{s(s+1)}$. So what is the resultant Angular momentum of an ...
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1answer
44 views

Slope of Graph of Wave Number vs inverse square of the principal quantum number(1/n^2) in Hydrogen Emission spectrum

What is the final expression we get for wave number in a hydrogen emission spectrum? Let us say for example from 6 to an orbit $n$. Considering that it is an emission spectrum, I think it would be ...
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0answers
30 views

Energy of emitted photon in Bohr's model

In Bohr's model for hydrogen atom, the energy of photon emitted by an electron is equal to the difference in potential energy of electron in the two orbits. I do not understand this part. Shouldn't we ...
3
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1answer
111 views

What is the exact definition of the radial distribution function?

I have been very confused by the radial distribution function which is often used in chemistry to predict the probability of finding an electron at a distance from the nucleus. From Atkins' Physical ...
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1answer
40 views

Software for the atom model of all elements [closed]

I want an atom model with shells but I haven't found one yet and the only software that created an atom was Cinema 4D. This software is not for beginners like me and I used a tutorial to make an atom ...
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1answer
28 views

Strong or weak force between protons and neutrons?

I had learned that what keeps the protons and neutrons bound is the strong force and the weak force has to do with radioactive decay. but today I read an article from Science Daily that contradicts ...
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1answer
73 views

Confusion about electron arrangement in elements

My textbook says, "The first shell can hold only 2 electrons. The second and subsequent shells can hold 8 electrons to give a stable noble gas arrangement." Can someone explain me if it is MAXIMUM 8 ...
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1answer
50 views

What is the real structure of atom showing every ORBITAL [closed]

Since the Bohr's atomic model was rejected and new concept of orbital was introduced so what is the real structure of an atom showing each and every orbital?
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0answers
29 views

Constructing two body Hamiltonian for Helium atom in hydrogen slater orbitals single particle basis [duplicate]

I am trying to construct a two body states to calculate the matrix elements of electronic Hamiltonian of Helium atom. $$H=-\frac{1}{2}\nabla^{2}_{1}-\frac{1}{2}\nabla^{2}_{2}-\frac{2}{\vec{r}_{1}}-\...
3
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2answers
57 views

Restrictions on transitions in Spectroscopy

Just for the sake of an example, let's assume a transition from one energy state to a higher energy state in atomic absorption spectrum If the energy difference between the ground state and first ...
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1answer
26 views

Why there will be only limited shells in a particular atom? [closed]

What is the maximum possible principal quantum number for an atom(any atom not a specific one) ?
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0answers
189 views

Don't understand why Rutherford was shocked by results of gold foil experiment

The way Rutherford's classic gold foil experiment has been presented (including by Rutherford himself) doesn't make sense to me. As many of you know, Rutherford famously described himself as being ...
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1answer
60 views

How are the molar mass and molecular mass of any compound numerically the same?

This observation is really annoying me, and the internet isn't providing me with any solid answers. Either their definitions of molar mass completely differ, or they don't stick to their own ...
4
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2answers
90 views

Is there a finite number to the possible state of electron in an atom?

Okay, I know you may say, there are infinite numbers of possible state of an electron between its ground state and ionic state, since energy levels get continuous as electron gets farther away from ...
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0answers
106 views

Why are 4s electrons removed before 3d electrons? [duplicate]

According to Aufbau's Principle energy of 3d orbital is greater than 4s orbital, so which filling 4s if filled beforehand 3d. Whereas while removing electrons 4s electrons are removed first. Why? I ...
4
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1answer
75 views

In Bohr's model what is angular momentum in the lowest orbital?

Angular momentum is given by: $n\frac{h}{2\pi}$ where $n=1,2,3...$ And angular momentum is also given by: $\sqrt{l(l+1)}\frac{h}{2\pi}$ By the first equation angular momentum should be $\frac{h}{2\...
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2answers
66 views

Atomic weight = expected weight?

The atomic weight of an element, is it accurate to say that another way to think of it is the expected value of that element's weight if we were to sample one at random from the environment? Are man-...
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1answer
56 views

Finding region of electromagnetic spectrum with wavenumber

A line with wave number $\pu{1.028\times10^{-2} nm^{-1}}$ is emitted in the spectrum of atomic hydrogen. In what region of the electromagnetic spectrum does this line occur? Do we find this by ...
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1answer
164 views

Radial probability curve [closed]

Can somebody give me a clue on how to solve the question in the picture for me given below
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0answers
33 views

What chemical compound contains the highest amount of hydrogen for a given volume?

For example liquid methane has a density of 0.422 g/cm^3 and is 1/4th hydrogen by mass, so it has more hydrogen per unit of volume than plain old liquid hydrogen at 0.07g/cm^3. Long-chain hydrocarbons ...
1
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1answer
148 views

How does the screening effect work for orbital in the same shell?

Energy of an orbital in a single electron system depends solely on n, while energy of orbital in multi electron system depends on n and l, why is that? I understand that the screening effect is at ...
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1answer
136 views

positive rays ?? (What and why)

Question : We were recently studying the chapter on Atomic Structure and we had a topic about cathode rays and the single particle of a cathode ray is called cathode ray particle. The next topic ...
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1answer
50 views

why would an alpha particle ejects neutron when bombarded on berreylium? [closed]

when an alpha particle hit berrelyium it emits neutron. Does the alpha particle causes unstability to the nucleus or any other reason?
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1answer
67 views

Quantization and Bohr's model

According to quantization it's said that emitted or absorbed energy is quantized. Then, when it's said in bohr's model an electron changes its orbit (Let's say it goes to a higher energy shell from $...
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0answers
66 views

Rutherford's alpha particle scattering experiment for sheets made of different metals [closed]

The correct order of increasing number of alpha particles passing undeflected through the foils of Au, Ag, Cu and Al of 1000 atoms thickness each in an alpha scattering experiment of Rutherford would ...
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0answers
46 views

Probabilities of Electrons in Orbitals [duplicate]

I've heard both of the following: An orbital is a region where there's a 90% probability of finding an electron An orbital is a region where an electron spends 90% of its time Are these essentially ...
6
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2answers
223 views

Why is there an orbital angular momentum if the electron isn't properly revolving around the nucleus?

I'm a tenth grader who's just been introduced to this subject of atomic structure, so please help. I recently read that an electron doesn't have circular motion around a nucleus, its motion is kind ...
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0answers
100 views

Quantum Mechanical Model of An Atom, Shells, Subshells [duplicate]

I've just been introduced to the quantum Mechanical Model of an Atom, so please bear with me on this one. Are Subshells and shell physical things, like do they really exist, or is it a concept only to ...
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2answers
118 views

Bohr energy formula for a single-electron system

A single electron atom has nuclear charge $+Ze$ where $Z$ is atomic number and e is electronic charge requires $\pu{16.52ev}$ to excite the electron from the second bohr orbit to third bohr orbit. ...
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1answer
48 views

Rutherford experiment [closed]

I am aware that in this experiment originally alpha particles were bombarded on gold foil. But recently I came across a question where this experiment was done with calcium and zinc instead of gold. ...
2
votes
1answer
61 views

Difference between probability and probability density of finding a particle in space

What is the difference between probability and probability density of finding a particle in space? I am at basics of the wave function and this thing confused me. Probability = $[\psi(x, y,z)]^2(\...
26
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4answers
2k views

Do electrons have some volume, area or shape?

I am in 8th grade now and when I was in 6th grade, my science book had diagrams of the electronic configuration of atoms. The electrons were round like spherical balls. Is it true that the electrons ...
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0answers
33 views

How did the atomic number and atomic mass of elements discovered? [closed]

Elements are small for our naked eyes.so,how did the discovery of its atomic number and mass number took place?
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0answers
54 views

Why do objects gain electrons? [duplicate]

I have read that objects gain electrons to become negatively charged and also that they lose electrons to become positively charged. I have also read that same charges repel each other and non-same ...
3
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1answer
95 views

Volume of orbitals

As I was learning about atomic structure, the lecturer made a seemingly dubious claim: The volume of a p orbital is one-third that of the s orbital. Thus, inter-electronic repulsions are ...
4
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2answers
108 views

For hydrogen like atom, find velocity from potential energy

PE of system is given by $$\mathrm{U(r) = \frac{-Ke²}{r^3}}$$ assume bohr model to be valid Find velocity For this I used $\mathrm{\frac{-PE}{2} =KE}$ and then used $$\frac{mv^2}{2} =\frac{Ke^2}{2r^3}...
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1answer
126 views

Atomic structure [closed]

We've got a homework and I know this question may seem so primitive, but I have already read whole textbook and I've been looking also on the Internet, but I still cannot find the right answer. I'd be ...
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1answer
36 views

How are ions formed? [closed]

I know that $\ce{H2O}$ is neutral. So how does adding one more hydrogen atom to it make it positive ion ($\ce{H3O+}$)?
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1answer
713 views

No. Of minimum Hydrogen atoms [closed]

No. Of minimum Hydrogen atoms required to observe maximum no. Of distinct spectral lines when electron jumps from O shell to K shell? My attempt - Total no. Of spectral lines = (5*4)/2= 10 = no. Of ...
2
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1answer
52 views

What facts are being used in this atomic structure question?

I wish to understand how to solve this atomic structure question: For the ground state, the electron in the H-atom has an angular momentum = $\hslash$ , according to the simple Bohr model. ...
2
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2answers
3k views

How do we find the angular, radial nodes and the quantum numbers when the radial probability distribution curve's equation is given?

I am having serious conceptual issues with the Schrödinger equations. Please note that I only have basic school level (11th grade) knowledge of these equations and we are expected to know very little ...