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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Trend of effective nuclear charge down a group
Does the effective nuclear charge decrease down a group? Many online sources,including Wikipedia show this conclusion with the calculated data. But our teacher told us and again some online sources ...
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Reason of screening effect
I am totally confused about the screening effect. Is it because of the repulsion of inner electrons which ultimately reduces the net force of attraction for the outer electron , I'm pretty sure that ...
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Will an electron release energy when it is added into an atom for which electron affinity value is negative (endothermic)?
According to my understanding, when an electron is added into an atom, it emits energy in the form of photons because it is a form of de-excitation or relaxation. This is when electron affinity will ...
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Is the concept of shielding effect true? [closed]
I searched about shielding effect in various websites...
I just got that inner electrons shield the outer electrons so that outer electrons experience less nuclear charge and which is called as ...
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Sargent-Welch 1947 atomic model kit, design and use
I collect and use vintage atomic / molecular model kits eg by Catalin, Courtaulds, Sargent Welch etc. These all represent molecules but intrigued by this Sargent Welch set (link below) dated 1947 ...
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Why do we only use the principal quantum number to calculate the energy of an electron in an H atom? [duplicate]
According to my high school textbook the energy of an electron in a hydrogen atom is $E = -13.6/n^2~\pu{eV}$, where $n$ is the principal quantum number of the orbital in which the electron is present.
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Sign Conventions for Electron Affinity and Electron Gain Enthalpy [duplicate]
In some of the books, negative sign is used for an exothermic Electron Affinity. But in others, a positive sign indicates an exothermic Electron Affinity. Now if we adopt the first sign convention of ...
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Does transfer of energy take place when radiation with less than required frequency hit the surface of a metal?
In photoelectric effect, does the transfer of energy take place when a photon with less work function hit the metal surface? I know that the electron can't be ejected but does the transfer of energy ...
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How does an electron's distance from the nucleus depend on angular quantum number?
My school teacher told us this and I couldn't get his reason:
The average distance of an electron (belonging to the same orbit) from the nucleus decreases with the increase in the value of angular ...
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How do we determine the local symmetry of anatase TiO2?
In this physical review B paper, the authors mentioned that the local symmetry of anatase TiO2 is D2d point group. Also, in this applied physics letters paper, the authors mentioned that the symmetry ...
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Question from J. D. Lee about Quantum Numbers
There's this question in J. D. Lee: Concise Inorganic Chemistry, which I haven't understood exactly.
Which of the following may have the same set of quantum numbers?
The last electron of scandium and ...
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Perforated Cathode in Anode Ray Experiment
While studying about the anode ray experiment (E. Goldstein), I had a doubt pop up in my head. In the experiment, a perforated cathode has been used. What is the exact reason behind that? Upon ...
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What does "predicted" mean in an electronic configuration?
I've noticed the term "(predicted)" appearing at the end of electron configurations for heavier elements. Could you explain what it signifies and the reason behind it? I haven't been able to ...
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Replacement of a nucleus with electrons by an effective nucleus
This question was asked in my test:
In a lithium atom the outer electron is in the second orbit. The interaction of this outer electron with two inner electrons can be accounted for by assuming that ...
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Find element atomic mass from compound
I bought a 1962 Nuclear Power Engineering by EL-Wakil
There is an exercise that reads:
Four compounds of one element contain 90.3, 16.5, 26.4, 22.87 per cent of that element by mass. The corresponding ...
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