57
votes
Accepted
Why isn't the American nickel magnetic?
There are many types of magnetic properties, including ferromagnetism, paramagnetism, diamagnetism, antiferromagnetism, ferrimagnetism, superparamagnetism, metamagnetism, spin glasses, and ...
- 12.1k
25
votes
Why isn't the American nickel magnetic?
None of the US coins are magnetic (ferromagnetic), except for the 1943 Lincoln penny (Steel Cents, made in steel and zinc to save copper for ammunition during wartime), which are considered magnetic. ...
- 39.5k
22
votes
Why isn't the orbital angular momentum also considered while calculating the magnetic moments 3d transition elements?
Simplistically speaking orbital angular momentum is present when some conditions are satisfied:
A set of orbitals are degenerate;
These orbitals can be "interconverted" by rotation about a certain ...
- 71.1k
16
votes
Accepted
Why does concentration of solutions of alkali metals in liquid ammonia change the magnetic properties?
I always suggest students to try Google Scholar when a simple Google search fails. I just searched three keywords : alkali metals ammonia solutions and the third result is highly relevant.
When your ...
- 39.1k
14
votes
Why doesn't curie temperature follow a periodic trend in ferromagnetic materials
TL;DR : There's no reason for it to show any periodicity. It doesn't depend in a simple way on the outer electron configuration of atoms. The specifics of crystal structure are important in ...
- 8,465
13
votes
Accepted
What is behind of the attraction between a burned matchstick with a magnet?
Some matchstick heads contain iron(III) oxide as a colorant.
The yellowish color of the burning match indicates that it has low oxygen, i.e. a reducing flame. It reduces the iron oxide to iron which ...
- 7,142
12
votes
Accepted
Did O₄ turn out to explain why liquid oxygen appeared to defy Curie's law? If not, what does?
The observation that oxygen did not seem to strictly follow Curie's law (where $1/\chi$ is linear with temperature) has been known since Kammerlingh Onnes pointed it out in the 1910's. By the late ...
- 8,349
11
votes
Accepted
Single-molecule magnet with electrically-controlled permeability: How does the Titan Shield from Deus Ex work?
Is there any existing examples of single-molecule magnets with permeability that can be controlled via altering current flow just like in case of electromagnets? If not, is there an explanation why it ...
- 817
11
votes
Accepted
How do I solve such questions on paramagnetism and ferromagnetism?
I believe GATE is a university entrance exam in India, so they will not expect you to solve an extremely complicated equation to predict ferromagnetism or to memorize an infinite list of substances. ...
- 39.1k
9
votes
Why is neodymium the most paramagnetic lanthanide?
This is from Shriver and Atkins' Inorganic Chemistry (p.586, 2009 ed) :
The magnetic moment of many d-metal ions can be calculated by using the spin-only approximation because the strong ligand ...
- 366
9
votes
Magnetic mercury
Don't use a mixture, just use pure Hg. Chill to 4.2 K, conveniently reached with liquid He, and all magnetic fields are excluded. Levitate on a magnet, sans yogi.
Mercury in a static magnetic field, ...
- 30.5k
8
votes
Accepted
Can PBE (and LDA) actually be a better choice sometimes?
Can PBE (and LDA) actually be a better choice sometimes?
Of course, they can. This is in fact one of the major problems with DFT: there is no systematic way of improving a functional, so we never ...
- 18.9k
8
votes
Why is gadolinium specifically used in MRI contrast agents?
The reasons may possibly be:
T1shortening
Relatively less adverse reactions
Increased contrast enhancement
The most commonly used clinically approved contrast agents for MR
imaging are ...
- 5,084
8
votes
Accepted
What atom is always paramagnetic and why?
Neon and argon are correctly eliminated, no questions asked. Henceforth, we do indeed need to pay attention to question semantics and the phrase ‘regardless of its electronic configuration’.
The key ...
- 67.3k
7
votes
Accepted
How to determine whether a organic compound is diamagnetic or not?
If all the electrons are spin paired then the molecule will be in a singlet state$^*$ and will be diamagnetic, if they are not so paired then it will be will be paramagnetic. The rules are the same ...
- 30.1k
7
votes
Accepted
Why are most organic molecules diamagnetic, when most of them have non-paired nucleus spins?
As requested, this is my answer:
The question is essentially about why nuclear contributions to magnetic behavior is generally neglected.
It is true that both nuclei and the electrons can carry ...
- 5,373
6
votes
Accepted
Hybridization, MOT and Paramagnetism
Paramagnetism is a form of magnetism whereby certain materials are attracted by an externally applied magnetic field. Valence bond theory (VBT) and hybridisation doesn't really do a good job at ...
- 7,342
6
votes
How do I solve such questions on paramagnetism and ferromagnetism?
Historically, the term ferromagnetism was used for any material that could exhibit spontaneous magnetization: a net magnetic moment in the absence of an external magnetic field (Wikipedia). However, ...
- 39.5k
5
votes
How to determine whether a organic compound is diamagnetic or not?
I see your point of confusion!
The above is the structure of tertiary butyl cation. It is clear that if we consider the electronic configuration of the central carbon it is $\mathrm{1s^2\,2s^2\,2p^...
- 67.3k
5
votes
Accepted
Amine Inversion and Paramagnetism
For somebody who is not well-versed in quantum mechanics, it might be natural to guess that this is the case. But if I were you, I wouldn't assume so.
Both electrons share the same p-orbital, and are ...
- 71.1k
5
votes
Accepted
Do magnetic fields generated from ion flow through a membrane channel have any physiological relevance?
For currents in biological systems the magnetic field is minuscule, and likely has no physiological effect.
That said, magnetoencephalography is based on measuring the tiny magnetic fields created ...
- 30.5k
5
votes
What is the magnetic moment of tris(oxalato)nickelate(IV)?
If the compound is really nickel(IV), then there are only two choices: a high-spin $\mathrm d^6$ or a low-spin $\mathrm d^6$ configuration, corresponding either to 4 or 0 unpaired electrons. As higher ...
- 67.3k
5
votes
NMR spectroscopy nomenclature: induced vs local vs effective magnetic field (B)
In this context, i.e. the discussion of how the chemical shift arises, I'd assume that the induced magnetic field is the "internal" magnetic field, which is generated by electrons ...
- 71.1k
5
votes
Why are fluorine-19 NMR spectra less affected by paramagnetic centers than other common nuclei?
$\ce{^{19}F}$ has similar NMR properties to $\ce{^1H}$ except in particular for the much larger chemical shift tensor terms and resulting larger chemical shift anisotropy (CSA). As a result CSA ...
- 20.9k
4
votes
Accepted
Ring currents of anti-aromatic and aromatic systems
Yes it has to do with the number of electrons. Consider a simple model of the electron on a ring, then the electron has to follow a circular path and its wavelength has to 'fit' exactly round the ...
- 30.1k
4
votes
Accepted
Questions related to distinguishing dimagnetism and paramagnetism and when is there magnetic properties
Do we determine paramagnetism / diamagnetism based on whether there is greater number of paired / unpaired electrons or if a transition metal ion has unpaired electrons, it must be paramagnetic?
...
- 71.1k
4
votes
Accepted
Magnetic and acidic properties of nitric oxide
That's true.
The bond order in $\ce{NO}$ is 2.5
The oxidation state of $\ce N$ is +2, and this is a colourless, paramagnetic gas (i.e. it is a radical, or contains an unpaired electron). (source)
...
- 25.2k
4
votes
Accepted
Is [PdCl2(PMe3)2] diamagnetic or paramagnetic?
You have not considered the d orbital splitting which has occurred due to the presence of the bonded ligands. Yes, the $\ce{Pd^2+}$ ion adopts the $\mathrm{4d^8}$ electronic configuration with two ...
- 10.2k
4
votes
Why is neodymium the most paramagnetic lanthanide?
Old question, but what is your textbook? Gadolinium is ferromagnetic just below room temperature and the most paramagnetic just above. Looking at this table we extract
$$\begin{array}{rl}\text{Metal}&...
- 1,058
4
votes
Is Co[Hg(SCN)4] diamagnetic?
There was definitely a typo and the book meant to write $\ce{Ca}$ instead of $\ce{Co}$. In the magnetic properties of a coordination complex, both the counter-ions and the coordination sphere metal ...
- 9,688
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