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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Coulombic energy of repulsion and exchange energy

In this Wikipedia link about the excited states of oxygen, this diagram is shown. The left most molecular orbital diagram is the first excited state of oxygen, and the MO diagram in the middle is the ...
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Electronic configuration of Co³⁺

Cobalt (atomic number 27) has electronic configuration $[\ce{Ar}]\mathrm{(4s)^2 (3d)^7}.$ I have seen two different configurations and explanations for $\ce{Co^3+}$ from a variety of different ...
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Why are sulfur trioxide and nitrate not isoelectronic, even though both have the same number of outer electrons?

Though $\ce{SO3}$ has the same number of outer electrons as $\ce{NO3-}$, the two are not isoelectronic. This statement is from JD Lee, but I could not understand why is he calling these two molecules ...
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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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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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Can the electrons be above the Fermi level(in a band gap)?

I've been searching this online for some time. It seems to be ignored most of the time but I found this on one website and I'm just trying to confirm it's true. Note that although the Fermi ...
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201 views

The affect of effective nuclear charge on energy gap between subshells

A few days ago my teacher taught me about $\mathrm{d}$ orbital contraction. He said that in $\ce{SF6}$ the hybridization of sulphur is $\mathrm{sp^3d^2}$. He said that although the $\mathrm{d}$ ...
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Electron configuration of Y(2+) ion

Why is the electron configuration of $\ce{Y^2+}$ $\mathrm{[Kr]5s^1}$ rather than $\mathrm{[Kr]4d^1}$? It seems as though there are numerous anomalies from the typical electron configuration rules, but ...
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215 views

Transition metals have a half filled s band in their metallic states

I was reading this "Chemical bonding at surfaces and interfaces" book. Here in page 69, they argued that interactions of transition metals to s band of adsorbate would be same because transition ...
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240 views

Are there no d-electrons in calcium?

For calcium, the electron configuration is $\mathrm{1s^2\:2s^2\:2p^6\:3s^2\:3p^6\:4s^2}$. Does it mean there's no electron in d sub-shell? Also, how would one write the electron configuration for a ...
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How does the electron configuration of platinum relate to its stability?

Does platinum's electron configuration, [Xe] 4f14 5d9 6s1, influence its reactivity and stability? Is the electron configuration the primary contributing factor to platinum's relative inertness? ...
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Transition of electron from HOMO to LUMO?

Molecules usually have certain number of (doubly) occupied molecular orbitals and an infinite number of unoccupied molecular orbitals but the probability of electron makes the orbitals shapes so, how ...
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93 views

Experimental Validation of Schrodinger's Electron Cloud theory

I am currently doing a report for school on the electron cloud atomic structure theory. One of the major points on my report is the experiments performed by the scientists (Schrodinger and Heisenberg) ...
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61 views

Why does this reaction take place in terms of electronic structure?

I need to know, in terms of electronic charge - the electrophiles and nucleophiles involved - how the electronegativity of the potassium and hydrogen atoms alongside the hydroxide and H+ ions result ...
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586 views

Difference between inorganic and organic semiconductors: electronic structure or configuration, or?

Organic semiconductors differ from inorganic semiconductors. In organic semiconductors the molecules are held together by weak van der Waals interactions and in inorganic semiconductors by covalent ...
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What is pairing energy of electrons?

What exactly is pairing energy when electrons are paired in orbitals and what is responsible for it.
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659 views

Calcium reactivity vs electronic configuration

Calcium is an alkaline earth metal, so it is reactive. But, it has two valence electrons. Don't those two electrons fill up the first energy level? Isn't an atom with a full energy level considered ...
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99 views

My text seems to say that the high(est) energy orbitals are not valence orbitals - everything else says otherwise. What's true?

A paragraph in my text reads Bonding involves the valence orbitals almost exclusively because these orbitals have the appropriate energies to interact strongly. Examine the electron energy-level ...
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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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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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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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Temperature dependence of emission lines from gases, for example, neon

Emission lines from Ne are frequently used as wavelength standards in spectroscopy. Reading around Wikipedia, I found about the Paschen law regarding the voltage required to start a discharge. My ...
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Does it exist a transgression to Hund's rule of maximum multiplicity principle in this given electron box notation?

The following question arises from a set of statements from which I'm asked to state whether they are true or false. This is as follows: Indicate which of the following statements are true or ...
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336 views

Why is nitronium ion an electrophile?

I have learnt that the species which have vacant orbital(s) are called electrophiles. But in this case, the nitrogen has a complete octet. The positively charged nitrogen ion has a valency of 4, of ...
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347 views

Why do the d orbitals contract when pairing of electrons start, because the size should increase due to increase in energy

The energy of an orbital is proportional to its mean radial distance, and since the 3d orbital is much larger it is much higher in energy than the 3s and 3p orbitals All references from JD Lee ...
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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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358 views

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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123 views

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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222 views

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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210 views

Valence shell expansion and sulfur

I've been searching some things regarding the ability of sulfur to accomodate negative charge and reached the conclusion that it's due to its size and its ability to expand its valence shell. I can't ...
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108 views

Formation of complexes by ferric ions is more frequent than ferrous ions. Why?

Looking at the electronic configurations of ferrous and ferric ions they are d6 and d5 systems respectively. Hence, ferric ions are more stable. But in octahedral complexes like hexathiocyanates, the ...
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Table of expanded electronic structures of atoms

Where can I find the table containing expanded electronic configurations for atoms in the periodic table, showing how outer electrons are distributed between different atomic orbitals? I really just ...
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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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95 views

“Sea of Electrons” - do the individual electron shells interact with each other?

I've often heard metals as having a "sea of electrons". I was wondering how the actual relationships between the electron shells of individual atoms are... do the electrons orbitals overlap the same ...
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491 views

electron counting for transition metal-oxo ligand compound

Using donor-pair method, how many electrons would an oxo ($O^{2-}$) ligand contribute? I cannot decide if it is 2 or 4.
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The ambiguity regarding aufbau principle

According to a Blog https://ericscerri.blogspot.com/2012/06/trouble-with-using-aufbau-to-find.html written by Dr.Eric Scerri, On moving from the $\ce{Sc^3+}$ ion to that of $\ce{Sc^2+}$ it is plain ...
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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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Do covalent bonds fit in with the orbital theory of atomic structure?

Which atomic model do covalent bonds adhere to? In the the covalent bond between $2$ oxygen atoms, we consider each oxygen atom to have $6$ valence electrons, thus resulting in a double covalent bond. ...

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