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This periodic law was stated by Henry Moseley, not by Dimitri Mendeleev
Opening heading
I think this article made a mistake in the trend for nuclear charge; this says nuclear charge increases as you go down a group (column), but other sources (nothing really citable, just my son's class notes and a Yahoo! answer post) say nuclear charge decreases down a column.
I don't want to edit this article, because I'm just a mom checking my son's chemistry homework, and I'm not completely certain about this.
Perhaps someone more knowledgeable would be willing to edit this article, correcting this and any other factual errors?
I'm not well enough versed in Chemistry to add this section but, I did come to this page looking for this information so I would like to see it added in the future. Perhaps also periodic trends in acid bases strength.
The following discussion is an archived discussion of a
requested move. Please do not modify it. Subsequent comments should be made in a new section on the talk page. No further edits should be made to this section.
The counter argument, per
WP:PLURAL, would seem to be (if) that periodic trends are "classes of specific things". This seems like a distinction clearer to someone else than it is to me.
ENeville (
talk)
21:49, 23 March 2012 (UTC)reply
I'm not sure how to explain this clearly, but the difference between this and the examples listed there is that here the singular form does not depend on the plural form for notability and the periodic trends are not usually considered to be an inseparable unit (like
polar coordinates or
Maxwell's equations). Each periodic trend (electronegativity down the groups, ionization energy across the periods, etc.) can be (and often is) referred to independently of the others. (The wording "classes of specific things" seems vague to me -
birds is a class of specific things, but the article is at
bird for the reasons in the first paragraph. A better wording might be something like "classes of specific things that naturally occur in a group".)
Double sharp (
talk)
10:04, 24 March 2012 (UTC)reply
Well, I think maybe we can look at the counterexamples Double sharp mentions: polar coordinates and Maxwell's equations. The first may be a bad example, since the article is actually at
polar coordinate system -- and that makes sense, because the topic is really the systematic method of using the coordinates, not the coordinates themselves. For Maxwell's equations, it makes sense to use the plural because each of the individual equations has its own name, properties, and (in many cases) article; the article is thus about a collection of equations rather than describing a set of properties that would make an equation a "Maxwell's equation". There is no concept that defines a "Maxwell's equation"; it's just a name given to an existing collection, so there's nothing to say about the concept generically. I think this article is similar; although there is such a thing as a single "periodic trend", the article is not about that, but rather is about the collection of trends known as "periodic trends", each of which has its own article. Nothing in the article talks about the concept of a periodic trend as a generality, so it makes sense to use the plural. So I guess I oppose.
PowersT23:16, 11 April 2012 (UTC)reply
The above discussion is preserved as an archive of a
requested move. Please do not modify it. Subsequent comments should be made in a new section on this talk page. No further edits should be made to this section.
I really think this article is quite confused in its basic definition!
The article starts off "In chemistry, periodic trends are the tendencies of certain elemental characteristics to increase or decrease as one progresses along a row or column of the periodic table of elements." This seems completely wrong-headed to me, and completely misunderstands both the common and scientific meanings of the word "periodic", and why the "periodic" table is so called! "Periodic" things are those which repeat themselves at regular intervals. The "periodic trends" which Mendelev famously noted in the elements (when arranged in increasing atomic weight) were recurring similar properties. It was on the basis of these recurrances that Mendelev decided where to break the table into a new column or row. In other words, the "definition" in the article is ass backwards. --
feline1 (
talk)
11:56, 17 February 2014 (UTC)reply
Merge into Periodic Law (Pt becomes a redirect to PL)
Merge into Periodic trends (PL becomes a redirect to Pt)
maybe some other option???
I note that the trends article is longer and older, having been around since 2006; the Law article is shorter and has only been an article since February 2016, although it was a redirect to
History of the periodic table since 2005. I note that
Periodic law (with a lower case "l") was also a redirect to
History of the periodic table (since 2004), but was changed to point to
Periodic table in 2007 and in 2008 to
§ Periodicity of chemical properties and finally, in 2015, to
Periodic trends when the section was expanded into a separate article.
Merge into(TBD). There is too much overlap in these two articles and not enough material to support two separate articles, much less a clear dividing line to know what should be in each article.
YBG (
talk)
07:44, 27 July 2016 (UTC)reply
I can't yet decide between Merge into Periodic Law and Merge into Periodic trends. Any help would be appreciated.
YBG (
talk)
09:03, 27 July 2016 (UTC)reply
I tend to be a bit timid in such matters, thanks for the encouraging boldness. But in this case, with two alternatives that I can't decide between, I'm glad to have input from other editors. Thanks!
YBG (
talk)
21:57, 27 July 2016 (UTC)reply