:Talk:Metal

The color coding of the chart under "Periodic table distribution of elemental metals" is absolutely hostile from an accessibility point of view. Having three shades of blue/violet is just plain ridiculous and almost requires going out of your way to making it difficult to impossible for colorblind individuals to see. Please change the charting to high contrast colors. — Preceding unsigned comment added by 2600:4040:B07B:9700:344D:4544:B11D:30AC (talk) 23:55, 20 May 2025 (UTC)

:Please read Wikipedia:Civility and edit you comment accordingly. Johnjbarton (talk) 00:09, 21 May 2025 (UTC)

Can we clarify if graphite is considered a metal, Since it conducts electricity moderately well and seems to have the general characteristics (of a metal) in the introduction. Or, Is it too soft to be a metal ? - Rod57 (talk) 12:17, 12 March 2024 (UTC)

Article says "In physics, a metal is generally regarded as any substance capable of conducting electricity at a temperature of absolute zero.[2]" - Is it "generally regarded" or just one persons idea ? It's a very theoretical definition rather than being something that can be tested or measured. If true, it would make all materials, while superconducting, metals. A more usual definition of a metal might be having free electrons in a conduction band ? - Rod57 (talk) 12:33, 12 March 2024 (UTC)

:The source is Nevill Mott. If you have another source, please let's have it. Johnjbarton (talk) 15:28, 2 May 2024 (UTC)

The electrical and thermal section read, in part:

:"Plutonium increases its electrical conductivity when heated in the temperature range of around −175 to +125 °C, with anomalously large thermal expansion coefficient and a phase change from monoclinic to face-centered cubic near 100 °C."

The source was given as Hecker, Siegfried S. (2000). "[https://sgp.fas.org/othergov/doe/lanl/pubs/00818035.pdf Plutonium and its alloys: from atoms to microstructure]" (PDF). Los Alamos Science. 26: 290–335.

Reading the source, it does not say anything about:

:*Pu increasing its electrical conductivity when heated in the temperature range of around −175 to +125 °C; nor

:*an "anomalously large" thermal expansion coefficient.

Nor did the article's citation give a page number/s specifying where the pertient facts were mentioned.

OTOH, Russell AM & Lee KL 2005, Structure-Property Relations in Nonferrous Metals, Wiley-Interscience, New York, p. 466, say that when Pu (a metal) is heated within a temperature range of 100 to 400K [–173 to 126.85 °C] its conductivity increases.

The same source shows that the simple monoclinic phase of Pu is stable below 122 °C (p. 465).

I have therefore amended the mention of Pu to read...

:"Plutonium increases its electrical conductivity when heated in the temperature range of around −175 to +125 °C"

...and added a citation to Russel & Lee, with a page number.

Since the fact that Pu undergoes a phase change from simple monoclinic to body-centred monoclinic is not germane to the point about its unusual tempertaure coefficient of resistivity, I've removed it.

--- Sandbh (talk) 13:03, 20 June 2024 (UTC)

:Please do more reading on fundamental physics, and careful analysis, see for instance https://www.rmcybernetics.com/science/diy-experiments/heat-and-resistivity#:~:text=The%20temperature%20affects%20the%20dimensions,flow%20than%20a%20thinner%20one or many other introductions to physics. With anomalous expansion, as in Pu this will have a large effect. Ldm1954 (talk) 11:24, 22 June 2024 (UTC)

The lede says:

:A metal (from Ancient Greek μέταλλον (métallon) 'mine, quarry, metal') is a material that when polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. These properties are all associated with having electrons available at the Fermi level, as against nonmetallic materials which do not.^[1][2]

Neither cite [1] not cite [2] say that nonmetallic materials do not have electrons available at the Fermi level.

[1] Kittel, Charles (2018). Introduction to solid state physics. Paul McEuen (Global edition, [9th edition] ed.). Hoboken, NJ: Wiley. ISBN 978-1-119-45416-8.

[2] Ashcroft, Neil W.; Mermin, N. David (1976). Solid state physics. New York: Holt, Rinehart and Winston. ISBN 978-0-03-083993-1.

— Sandbh (talk) 04:28, 28 June 2024 (UTC)

:{{ping|Ldm1954}} In this edit [https://en.wikipedia.org/w/index.php?title=Metal&diff=1231620742&oldid=1231413251] the reasons you gave for removing the disupted tags were:

::"Added specific chapters. Those exact words are not used, but the science explained in those chapters is equivalent. It matters to read and understand."

:Your reasoning breaches WP:NOR i.e. no orginal research. Neither source explicitly makes the statements concerned. --- Sandbh (talk) 13:20, 29 June 2024 (UTC)

::Neither source has to make exactly that statement. What is included is a rephrasing which is covered in all solid state physics books. Unfortunately you believe that sources must be verbatim, this is wrong. If you want to challenge this I will post on WP:PHYSICS, I know what the response will be. Ldm1954 (talk) 13:49, 29 June 2024 (UTC)

Please comment here, or just edit. Ldm1954 (talk) 13:44, 19 July 2024 (UTC)