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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If most probable radius is inversely proportional to orbital quantum number, how is energy proportional to n+l

The closer an electron to the nucleus, the lesser the energy. Then why does a 3d electron have higher energy and be closer to nucleus than a 3s electron?
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How to compare magnetic moment of chromium(III) and cobalt(II) ions?

Is there any way of comparing magnetic moment of $\ce{Co^2+}$ and $\ce{Cr^3+}$ by just going through their electronic configuration? Or is it just experimental data?
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Electron configuration of the Superactinoids (Z > 118) [duplicate]

I have a question: Do I see it correctly that the electron configuration of the superactinoids given in wikipedia was somehow calculated differently (quantum mechanically?); e.g. Z=119: [Og] 8s1 Z=...
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What happens to the 2s orbital in carbon-hydrogen bonds? [closed]

I was taught in high school that carbon atoms by themselves are capable of establishing covalent bonds with with as far as four hydrogens atoms. Nowadays, trying to understand the topic in-depth, I ...
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Why is potassium less dense than sodium?

Potassium has a density of $\pu{0.86g/cm3}$ and sodium has a density of $\pu{0.97g/cm3}$,even though potassium is below sodium and one might expect the alkali metals to exhibit monotonously increasing ...
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What is electronic configuration of manganese in the manganate(VI) anion?

The electronic configuration of the central atom of $\ce{[MnO4]^2-}$ if given out to be $e^1\,t_2^0$ I want to know how to identify which one of the d-orbitals does this configuration utilizes because ...
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How are Quantum Dot molecules formed and what properties do they hold apart differently from singular quantum dots? [closed]

I am trying to understand the science and phenomena behind the function and operation of quantum dot molecules, but the only articles I run into talk about the synthesis of them. Could this be ...
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Is the spin of the transferred 4s electron always opposite to the spin of 3d electron in chromium?

I am studying atomic structure and found out that Chromium has an exception in electronic configuration. One electron from 4s jumps to 3d to achieve stability. let's say the spin of transferred ...
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Noble gas configuration and valence shell electrons [duplicate]

I know that the maximum number of electrons within a shell is equal to 2n^2. I would think that the noble gases would reflect this but that isn’t always the case n = 1 2(1^2) = 2, this is the atomic ...
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Bond formations in doping of semiconductors [duplicate]

I was reading about semiconductors and found out that semiconductors are doped with either 13th group or 15th group elements which are named p-type and n-type semiconductors, respectively. In n-type ...
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Are these correct? [closed]

We were tasked to write the electronic configuration of the elements in the third energy level. My answers are: 1s2 2s2 2p6 3s1 1s2 2s2 2p6 3s2 1s2 2s2 2p6 3s2 3p1 1s2 2s2 2p6 3s2 3p2 1s2 2s2 2p6 3s2 ...
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Why does Co(I) have a 3d8 configuration?

Why is the electron configuration of $\ce{Co^+}$ $[\ce{Ar}](\mathrm{3d})^8$? Since neutral $\ce{Co}$ itself has a $[\ce{Ar}](\mathrm{4s})^2(\mathrm{3d})^7$ configuration, wouldn't the ionised electron ...
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Should Birge–Sponer plots always have a negative gradient?

I have a set of data I would like to use the Birge–Sponer extrapolation with, but the data is the wavenumbers of the bands in the vibrational-electronic spectrum of a diatomic molecule for $v' = 0, 1, ...
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Quantum numbers associated with electron

I wanted to get your opinion on something. I was given the electron 5p^3 and was told to find the quantum numbers associated with it. I got: n=5 l=1 Ml=1 Ms= +1/2 However, my teacher has told me that ...
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D block elements electronic configuration

We have found the electronic configuration of d block elements.As we move from left to right in the periodic table the energy of the 3d subshell is decreased and it becomes smaller than the energy of ...
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Predict the valence configuration of this element using the first five ionization energies [closed]

If the first five ionization energies of an element are, respectively: $\pu{1.09 kJ/mol}$, $\pu{2.35 kJ/mol}$, $\pu{4.62 kJ/mol}$, $\pu{6.22 kJ/mol}$ and $\pu{37.83 kJ/mol}$, to which group of the ...
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Physical interpreation of coulomb and exchange integral

When trying to solve the Schrodinger equation for the electronic hamiltonian: $$H_{el} = \sum_{i=1}^{N} \bigg( - \frac{1}{2}\nabla_i^2 - \sum_A \frac{Z}{r_{i_A}} \bigg) + \sum_{i>j=1}^{N}\frac{1}{...
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Help understanding how “steric effects” are distinct from “electronic effects”?

@jakebeal's excellent answer to Why do animal cells “mistake” rubidium ions for potassium ions? includes the following passage: In the case of potassium versus sodium, which are both very important ...
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Aluminium isopropoxide electronic structure

From Wikipedia: A tetrameric structure of the crystalline material was verified by NMR spectroscopy and X-ray crystallography. The species is described by the formula $\ce{Al[(μ-O-i-Pr)2Al(O-i-Pr)2]3}...
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Describe the formation of the [PbCl4]2- complex ion

The $\ce{[PbCl4]^{2-}}$ complex ion is formed when $\ce{PbCl2}$ is exposed to excess $Cl^-$ ions in solution as explained here and here through the following reversible reaction: $$\ce{PbCl2(s) + 2Cl^-...
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Electron Configuration confusion

I'm getting so much conflicting information!! When I practice electron configuration and google to check my answers I often see configurations that list the 3d orbital before the 4s orbital (...
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Bonding in 1,4-dihydro-1,4-diborinine

In most aromatic compounds (e.g. benzene), their $\pi$-bonding molecular orbitals are completely occupied and their antibonding molecular orbitals are unoccupied. I'm wondering if there are any ...
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What is the 'electronic energy', in units of 'negative' hartrees, of a molecule?

On a NIST (National Institute for Standards and Technology) page on the molecular details of water and it's various isotopologues, I came across this: Electronic energy: -76.4089547246 hartree There ...
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Why is +3 the oxidation state of Indium? [duplicate]

The three more energy electron layers for Indium(49) are, sorted from lower to higher energy: [Kr] $5\text{s}^24\text{d}^{10}5\text{p}^1$ From this configuration, it could be said that is easy to ...
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What is the electron configuration of platinum? [closed]

Some textbooks write the electron configuration for platinum (Pt) as $\ce{[Xe] 4f^14 5d^9 6s^1}$. However, some also write it as $\ce{[Xe] 4f^14 5d^8 6s^2}$. Which is correct? I hope someone can help ...
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Is the quantum number $L$ a combination of the azimuthal and magnetic quantum numbers $(\ell, m_\ell)$?

Somehow, I am getting confused about this... In the $J=L+S$ equation about total angular momentum, which of the four quantum numbers used to describe the electrons and their states is included in the $...
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How can I solve a problem like this, “what is the eletronic distribution of Iron in layers”

What is the eletronic distribution in layers of Fe? a) 2 – 8 – 10 – 2. b) 2 – 8 – 12. c) 2 – 8 – 8 – 4. d) 2 – 8 – 18 – 18 – 8 – 2. e) 2 – 8 – 14 – 2. What is the ...
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In metal complex electron counting, is the neutral or ionic formalism more correct?

I have been practicing finding total valence electron counts by both methods, and a few points have arisen that have confused me. 1) Which method gives the true d-electron count? From what I ...
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Electron configuration of non-hybridized carbon

I'm currently learning about orbital hybridization in carbon. I see that carbon has an electron configuration of 1s2 2s2 2p2. However, there are actually three p-orbitals in the second shell, namely ...
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Viewing and capturing real time values of Electronic balance measuring instrument on television set and computer monitor larger screens [closed]

https://en.wikipedia.org/wiki/Weighing_scale Is it possible to view and capture real time values of Electronic balance measuring instrument using wired, wireless,CCTV technology on television set or ...
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Why does the Most Stable State of an Atom Tend to be One with Full s and p Subshells?

I'm new to posting on stack exchange, although I've read a lot of it before. This question seems like it might end up being marked as a duplicate, but I've looked through a lot of the similar ...
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Can someone help me figure out what the noble gas configurations for zirconium and holmium are? [closed]

I am currently working on noble gas configurations in chemistry and I am having a hard time understanding why I got two questions wrong on a practice. The instructions for the practice are here: Write ...
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Why aren't elements with two valence shell electrons stable?

We all know that hydrogen becomes stable by completing duplet and helium is stable since its valence shell has completed the duplet Still, other elements don't behave like that. I want to know that ...
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Do higher orbitals have more energy or less energy? [duplicate]

I've recently learned that as an orbital gets larger, its energy gets closer to 0. Before this, I learned that when an electron moves down an orbital it releases the energy difference between those ...
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When does replacing a double bond with a lone pair result in a valid resonance structure?

Take molecules A and B below. In A, we can move the electrons from the green pi bond into a lone pair on oxygen, then move the blue lone pair of electrons from the other oxygen to form a new π bond, ...
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Why do you count both bonding electrons towards an atom's octet, but you only count one of them towards the atom's charge? [duplicate]

For example, oxygen is neutral when it has just 6 electrons. But the pink O in the molecule pictured has 3 bonds giving it 8 electrons, a full-octet. It's more electronegative than all the atoms it's ...
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Why do the lanthanides and actinides have a 5d and 6d orbital, respectively? [duplicate]

I was taught in school that the rare earth metals were the $\mathrm{f}$-orbital group. Additionally, the Aufbau principle states that the order of orbitals based on energy levels is $\mathrm{6s4f5d}$ ...
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How to determine the efficiency of intermolecular charge transfer?

Lets say we have 2 molecules: A and B. Both of these molecules associate with another molecule C. Upon association two complexes form A-C and B-C. We can experimentally see that upon association a new ...
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Electron configuration of iron(I) cation

What is the electron configuration of $\ce{Fe+}$ cation? \begin{align} \ce{Fe+} &\!:~ [\ce{Ar}]\mathrm{(3d)^6(4s)^1}\label{chm:1}\tag{1}\\ \ce{Fe+} &\!:~ [\ce{Ar}]\mathrm{(3d)^7(4s)^0}\label{...
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Book Recommendation for Molecular Orbital Theory [duplicate]

I posting my question here since I have seen similar questions but I haven't found the specific answer I am searching for. I am seeking textbook recommendations on Molecular Orbital Theory with ...
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How can an element have two outermost shells incomplete? [closed]

As I read my book, I saw its written that the Transition metals have two outermost shells incomplete. But , as I had read earlier, that shells are filled in stepwise manner. So how is this possible? ...
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Why does covalent bonding not break down if observer effect can be applied to atomic electrons? [closed]

The observer effect in quantum mechanics states that when unobserved, quantum particles such as electrons can simultaneously occupy two different states. In an atom of any element, where there are ...
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How to calculate electric force on valence electron?

In order to understand the periodic trends more fully, I wanted to calculate the net force exerted on the electron (with the highest principal quantum number and azimuthal quantum number) of an atom. ...
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Analysis of post-HF wavefunctions

Hartree-Fock method introduces electron (spin)orbitals and they are commonly used for qualitative rationalization of many molecular properties. However, MOs have meaning only if we ignore electron ...
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Why do subshells and orbitals exist? [closed]

I'm just a curious high school student. Sorry if this sounds dumb. How exactly did the concept of atomic subshells and orbitals come about? And why exactly are there n-1 subshells and 2l+1 orbitals? ...
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Lanthanum Electronic Configuration [duplicate]

Lanthanum has electronic configuration [$\ce{Xe}$] $4\mathrm{f}^0$ $5\mathrm{d}^1$ $6\mathrm{s}^2$. Why is the $4\mathrm f$ sub-shell not filled even though we know that $4\mathrm f$ is filled before $...
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Thermionic Emission Conservation of Energy

I am learning about thermionic emission and how it led to the vacuum tube. It is said that thermionic emission was a way to increase the flow of electrons from a signal (e.g. in a radio receiving a ...
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What is the correct electronic configuration of darmstadtium?

Some of the places, the electronic configuration of darmstadtium ($\ce{Ds}$) is given as $\mathrm{6d^9 7s^1}$ while at some other places, it is $\mathrm{6d^8 7s^2}$. Which among the two is correct?
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Methylene “anti” Jahn-Teller effect

Yesterday a Reddit user posted a page from Morrison's Organic Chemistry in which it is said that singlet methylene is less stable than triplet methylene. Another user asked basically the same I'm ...
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Is 2s a subshell or an orbital? [closed]

My textbook says They will then fill the $2s$ subshell, and then the $2p$ subshell... Yet half of ChemSE refers to $s,p,d,f$ as "subshells" and the other half seems to refer to $1s, 2p...$ ...

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