Questions tagged [electronic-configuration]

In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals.

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Additional example determining Marcus parameters searched

Background / theory: The electron transfer in organic materials was formalized by the Marcus theory, introducing $|H_{ab}|$ to describe the how molecules (or more generally: sites) are coupled with ...
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How are the π bonds arranged in Osmium Tetroxide?

The structure of $\ce{OsO4}$ has puzzled me greatly for a while. I know that it has a tetrahedral geometry. I am quite piqued at the thought of how the $π$ bonds were arranged in the molecule. My ...
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What is the electronic configuration of La⁺? [on hold]

Second IP of La is most likely to second IP of which element: (1) Be (2) Ba (3) Ca (4) Zn The given answer is calcium. I don't understand if the 6s electron or the 5d electron leaves on ...
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38 views

Noble Gas Configuration of CN [on hold]

I have a homework question about molecular orbitals. I have to draw the diagram for $\ce{CN}$ and then answer some questions about it. One of the questions is the following: "Does CN have noble gas ...
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Why are there 14 electrons in the third shell of iron atom?

The third shell must contain at least 18 electrons. But in iron there are 14 electrons in third and 2 electrons in 4th. Why are there 14 electrons in the third shell of iron atom?
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Electronic configuration in [Ni(CN)4]2-

$\ce{[Ni(CN)4]^2-}$ is a low spin , inner orbital complex having $\mathrm{dsp^2}$ hybridisation. According to Crystal Field Theory, $\ce{CN^-}$ is a strong field ligand that causes pairing of ...
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Density of d-block elements

Something that confuses me slightly is the trends in density when comparing periods 4, 5, and 6 in the d-block. Looking at periods 5 and 6, the density peaks at group 8, with ruthenium and osmium, ...
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Plutonium element configuration

For Plutonium 94 when I do it's element configuration I get 1s2-2s2-2p6-3s2-3p6-4s2--3d10-4p6-5s2-4d10-5p6-6s2-4f14-5d10-6p6-7s2-5f6 I found on this site that I'...
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Electronic configuration

I was preparing for an exam and I saw one question which is difficult to understand: The electronic configuration $\mathrm{(1s)^2(2s)^2(2p)^6}$ does not belong to: a) any element b) anion ...
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Stability of subshell of chlorine atom [duplicate]

Why is the valence shell electronic configuration of Chlorine atom 3s2 3p5 and not 3s1 3p6, so that it becomes more stable ?
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Two different electronic configurations for cerium

Depending on the textbook there are two different electronic configurations stated for cerium. On the one hand $$[\ce{Xe}]\mathrm{4f^15d^16s^2}\quad$$ and on the other hand $$[\ce{Xe}]\mathrm{4f^...
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Triplet oxygen ene reaction with enols

It is observed that whereas singlet oxygen is required for an ene reaction with an alkene to give an allyic hydroperoxide, triplet oxygen will react similarly with an enol to give an alpha-hydroperoxy ...
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1answer
891 views

Are the Phosphate and Sulfate ion diagrams with double bonds an invalid picture?

Whenever you see an image of phosphate, it's always shown having 5 bonds. 3 single bonds to anionic oxygen atoms and a double bond to an extra neutral oxygen. Not only that, but they're shown being ...
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Atoms or molecules with spin 1 in the ground state?

Is there any atom or molecule that has spin 1 in its ground state? Do Hund's rules keep this from happening for an atom? The reason I'm curious is that it would be nice to have a spin-1 example for ...
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What is SPDF configuration?

Recently in my chemistry classes, the teacher spoke about SPDF configuration and then said that we'll be taught about it in higher classes. But I'm sorta curious to know that what is SPDF ...
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What is the electronic structure of Mn in KMnO4 and K2MnO4?

I know that is is d3s hybrid. But in my book it is unclear which orbitals participate in pi bond with O. I think it should be both p and d orbitals of Mn that do.
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Explaning Cis & trans isomers through VSEPR

Total rewrite as was a panic-stricken 2am question. Unfortunately I wrote on an application that VSEPR theory is a reason of Cis-Trans isomerism (specifically in fatty acids however I doubt that ...
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What is the definition of a bipolaron and a dipolaron?

I wondered about the exact definition of a bipolaron? In particular, if I have an oxygen vacancy in a metal oxide and the 2 excess electrons (when forming a neutral oxygen vacancy) localise on the 2 ...
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Explanation of metallic crystal structures using orbitals and electron configuration

There has to be a direct relation between metallic crystal structure formation and electrons in orbitals. For instance, we know that Fe2+ forms body centered cubic or bcc structure with the ...
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2answers
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Why is the ground state electronic configuration of Group 10 (Ni group) elements so anomalous?

While studying about d block elements I came across this table showing outer shell electronic configuration of group 10 elements $\ce{Ni}$ $ $ $ $ $ $ $ $ $ $ $3d^8$ $4s^2$ $\ce{Pd}$ $ $ $ $ $...
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1answer
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Why is a compound that is more stable gives out less energy upon reaction? [closed]

I am having trouble relating stability with energy released. For example, I am looking at a statement regarding Benzene that says, since delocalised electron model of Benzene is more stable than the ...
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1answer
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Tungsten 4+ ion magnetism?

I just had a quiz and struggled on a particular question: Tungsten forms a $+4$ ion. It is observed to be diamagnetic. The electron configuration for this ion may not be what you would expect. ...
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1answer
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Why is the graph of fluorescence vs. wavelength continuous?

If the emission of a photon from an excited state to the ground state occurs with a precise energy, then why is it that wavelengths that differ from lambda max have values on a fluorescence vs. ...
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1answer
97 views

How to write electronic configuration of p-orbitals?

For example, the electronic configuration for the element boron can be writen as: 1s2 2s2 2p1 However, it is can be written more accurately by taking the different p-orbitals into account: The ...
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Autoionization state

I am reading this paper: "Role of Autoionizing State in Resonant High-Order Harmonic Generation and Attosecond Pulse Production" In the paper a transition from the $\ce{In+}$ ground state to an ...
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1answer
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Do atoms react to fill outer shell or 8 valence electrons? [duplicate]

I recall in middleshool chemistry we simply said electron shell configurations were 2,8,8,many which I would have no problems with. But now I'm learning that shells contain $2n^2$ electrons where n ...
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Effect of spontaneous transmutation of atom in crystal

What happens to a compound when one of its atoms changes via spontaneous nuclear reaction to an atom with very different bonding? For example, beryllium-7 turns into lithium-7 with a half-life of 53 ...
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Removal of electrons from orbitals doubt

I recently encountered a question asking whether [PtCl4]2- has square planar geometry. I know that Pt has an electronic configuration of [Xe] 5d9 6s1, in the given compound Pt2+ is there, so the E.C ...
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Can factors such as non-chelating ions in solution or the temperature of solution change the d orbital splitting of complexes?

My currently primitive understanding of metal complexes is that the d orbital splitting depends on: Identity of central ion Charge density of ligand Geometry of complex ion oxidation number of ...
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What are the differences in shapes between molecular geometry and electronic geometry?

In my chemistry course we are told that molecular geometry considers only atoms as part of the shape, while electronic geometry considers atoms and electrons as part of the shape. However, I can't ...
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Shortcut method to find atomic term symbols ignoring the spin orbit coupling

Is there any shortcut method by which we can find the atomic term symbols ignoring the spin-orbit coupling, i.e. ignoring the values of J. For instance, when writing the d-d transitions for any ...
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1answer
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Ammonium considered as metal

Why ammonium ion has very similar properties to the heavier alkali metals and is often considered a close relative? Ammonium is expected to behave as a metal ($\ce{NH4+}$ ions in a sea of electrons) ...
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1answer
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Cerium electronic configuration change from 0 to +2 oxidation state

Cerium in $0$ oxidation state has electronic configuration $$[\ce{Xe}]\mathrm{(4f)^1(5d)^1(6s)^2}$$ But when it gets oxidised to $+2$ state, it becomes $$[\ce{Xe}]\mathrm{(4f)^2(5d)^0(6s)^0}$$ ...
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How do I calculate the full configuration interaction Hamiltonian of H2

I have been trying to follow the paper titled "Towards Quantum Chemistry on a Quantum Computer" (https://arxiv.org/pdf/0905.0887.pdf) by simulating their results on a quantum computer simulator. ...
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Why is the orbital angular momentum of a pi electron along the axis of two atoms' molecule one?

I'm reading quantum chemistry. The book says that the orbital angular momentum of a $\pi$ electron along the symmetry axis of a molecule made up of two atoms is $\pm 1$. I think this is a primary ...
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398 views

Why BiCl5 isn't stable?

I read this in a textbook: $\ce{Bi(V)}$ is very unstable and is a good oxidizing agent. Why does it happen that way? Is it because in $\pu{+5}$ oxidation state $\ce{Bi}$ pulls in more electrons ...
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1answer
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How to identify lewis acids and bases

What is the general methodology to identify Lewis acids and bases in an acid base reaction? Do we need to draw structures to identify which species is the electron donor and which one the acceptor, or ...
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Why do elements in columns 6 and 11 assume 'abnormal' electron configurations?

When I look around for why copper and chromium only have one electron in their outermost s orbital and 5/10 in their outermost d orbital, I'm bombarded with the fact that they are more stable with a ...
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4answers
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How many valence electrons do elements in the d block have?

I just noticed that on the periodic table it doesn't say how many valence electrons there are for each column in the d block. How do I find out how many valence electrons elements in the d block have?...
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How to derive a state symmetry in D2h point group from its wavefunction?

Let's have an atomic carbon with the following electron configuration: $$ 1s^2 2s^2 2p^2 $$ One of it's levels is ${}^1S_0$, which is corresponding with the following state: $$ \begin{align} \left| ...
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How to specify atomic carbon terms in the coupled and uncoupled representation?

So, we know, that the atomic carbon in the electronic configuration $1s^22s^22p^2$ has the following terms $${}^1S, {}^1D, {}^3P$$ My question is - how can I correctly specify these terms in the ...
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How many electrons are around the platinum in an ethenetriplatinate complex?

In $\ce{[Pt3(C2H4)]-}$, how many electrons are there around platinum? While solving this problem I thought three $\ce{Pt}$ formed a triangle with ethylene above. But I was confused about how the $\ce{...
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1answer
71 views

Aufbau principle in filling Ti

A few weeks ago, I was given this question to complete: The ground state electronic configurations of Ti is $\ce{[Ar] 4s^2 3d^2}$ State whether it follows the Aufbau principle or not. If not, ...
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Why do 3d orbitals have lesser energy than 4s orbitals in transition metals? [duplicate]

This is quoted from Jim Clark's Chemguide For reasons which are too complicated to go into at this level, once you get to scandium, the energy of the 3d orbitals becomes slightly less than that of ...
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Can an atom bond with more than 8 other atoms?

Is it possible for an atom to bond with 8 other elements (same or other type)? If yes, then please give some examples. If no, then what could be the possible reason for it? My question is not about ...
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1answer
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What does it mean that an electron quantum numbers are n1= 4 - l1?

I'm trying to solve some exercises from the 2017 IChO, and the problem 6-A1 states that in first ionization, an electron with the quantum numbers $n_1 = 4 - l_1$ is removed. Now, I've never seen ...
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Why is helium considered as a non-metal?

How can helium be considered as a non-metal based on its chemical properties? Helium is a noble gas; it does not take part in chemical reactions under ordinary conditions. But non-metals tend to gain ...
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2answers
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How does one find the ground-state term symbol for a configuration that is exactly half-filled?

For instance, the ground-state configuration of N atom is a $p^3$ configuration of all parallel spins and one electron in each $2p$ orbital, which has: Total spin angular momentum, $S = 3 * \frac{1}{...
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725 views

Configuration Interaction matrix composition from electronic configurations

The six electronic configurations below could all be found in the matrix elements of the CI matrix at CISD level. How do I construct the 6 x 6 CI matrix composed of these six configurations and which ...
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1answer
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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 ...