Questions tagged [atoms]
Smallest particle still characterizing a chemical element. It consists of a small nucleus charged positively, carrying almost all of the atom's mass, with electrons surrounding it. This tag should be applied to questions that specifically concern atoms or their properties. For the charged particles, please use [ions] instead. If your question is specifically about [protons], [neutrons], or [electrons], use those tags instead.
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Effect of Polarizability on ALL van der Waals forces?
While learning about van der Waals forces today, I was on board with the idea that the strength of London forces should depend on the polarizability of the molecule.
However, my teacher and a few ...
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Why does an atom become positively charged when it shares its lone pair? [closed]
Why does an atom become positively charged when it shares its lone pair?
In NH3, Nitrogen doesn't get positive charge when forming covalent bond with Hydrogens. But why does it get positive charge ...
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Why is the teacher saying here that relative atomic mass unit is equal to total number of nucleons?
Why is the teacher saying that relative atomic mass is equal to the total number of nucleons here? Can't a nucleon be either a proton or neutron, but the mass of a proton or neutron is slightly ...
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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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Why aren't there different peaks for different IE in PhotoElectron Spectroscopy (PES)?
The way I understand PES is that you shine a light on a bunch of atoms and measure the kinetic energy of photons to determine ionisation energies (or energies of electrons... is that different?).
I ...
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Challenging Orbital Restrictions
According to the n-l-1 formula for nodal count, wouldn't 1p, 1d, and 1f orbitals be possible since l (angular momentum quantum number) can be 1, 2, and 3 respectively for a principal quantum number (n)...
user145559
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How did early chemists work out the number of protons in the nucleus?
I was reading about the history of the periodic table and the description of an element’s atomic number as its proton number. I couldn’t find the source again but it was stated that they figured out ...
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Stability of atoms with 4 valence electrons [closed]
How do atoms with 4 valence electrons stabilize? Do they gain or lose 4 electrons?
This might be a bit of a stupid question, but I'm not sure and I can't find anything online.
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Wave function in Schrodinger's model
I am trying to wrap my head around the Schrodinger's quantum mechanical model of an atom.
According to the NCERT$^1$, the Schrodinger's equation is given by:
$$\hat{H}\Psi=E\Psi$$ where $\hat{H}$ is ...
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On the relativistic contraction of orbitals
In Platinum $\text{Pt}$, why do $\text{s}$ and $\text{p}$ orbitals contract when electrons start travelling at relativistic speeds $|v|\sim c$, while $\text{d}$ orbital expands?
The way I reasoned ...
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What is the cause of different metal densities? [duplicate]
What causes differing density?
Is one metal more dense than another because the atoms are larger (more mass per atom), or because the atoms are closer together? Or both?
Example:
Aluminum
Density: ...
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Does ionisation change the physical/chemical properties of an atom?
From what I have learned, the number of electrons on the outermost shell (called the valence electrons), determines the chemical properties of an atom, this is why elements in the same group have ...
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Law of multiple proportion fitting in the notion of an atom
I have been reading about atoms. Currently, I am referring to the book "Atom : Journey across the subatomic cosmos" by Issac Asmov.
I believed that if we start dividing something so we can ...
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how can I tell compton versus coherent scatter apart?
I am trying to get a better understanding of compton and coherent scatting, along with all the other interactions. It has seemed like a lot to memorize and I am trying to find ways to more easily ...
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