Talk:Periodic table

Periodic table is a featured article; it (or a previous version of it) has been identified as one of the best articles produced by the Wikipedia community. Even so, if you can update or improve it, please do so.

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RfC: 4-color PT or 1-color PT

Interested editors are invited to participate in a discussion affecting this page at WT:WikiProject Elements § RfC on the classification of chemical elements on the periodic table. YBG (talk) 03:13, 24 May 2023 (UTC)[reply]

Improving the flow of the structure of the article

To improve the flow and balance of the first two sections I've rearranged things as follows:

Before
1 Overview
  1.1	Atomic structure
  1.2	Electron configuration
        1.2.1 The order of subshell filling
  1.3	Electron configuration table
  1.4	Group names and numbers
  1.5	Presentation forms
2 Variations
  2.1	Period 1
  2.2	Group 3

After
1 Overview and variations
  1.1  Group names and numbers
  1.2  Presentation forms
  1.3  Period 1
  1.4  Group 3
2 Atomic structures of the elements
  2.1  The nucleus and its surrounding electrons
  2.2  Electron configurations
       2.2.1 The order of subshell filling
  2.3  Electron configuration table

Before, I felt there was too much technical content in the first section—which is supposed to be an overview—dealing with atomic structure and electron configurations. As well, atomic structure is important enough to merit its own section.

After, the "Overview and variations" section now has more of an holistic flavour, before moving on to look under the hood in the next section, "Atomic structures of the elements."

In the process I trimmed some duplicated content at the head of the original "Overview" section. --- Sandbh (talk) 06:38, 4 June 2023 (UTC)[reply]

Typo

The article includes an obvious typo, but I’m not sure how to correct it.

it now says “The realisation that lanthanum is not an d-metal …”
should it say “The realisation that lanthanum is not a d-metal …”??
or should it be: “The realisation that lanthanum is not an f-metal …”??

@Sandbh: could you or someone else please fix this? YBG (talk) 22:49, 4 June 2023 (UTC)[reply]

@YBG: The first. Done. Double sharp (talk) 09:37, 5 June 2023 (UTC)[reply]

History

It should start even earlier in 1789 with Antoine Lavoisier’s "Traité élémentaire de chimie, présenté dans un ordre nouveau et d'après les découvertes modernes." Esteban Outeiral Dias (talk) 16:10, 15 August 2023 (UTC)[reply]

Missing element, literally

In the section called "the order of subshell filling" there are a few tables, but the last table is missing Helium. It's immediately above the section called "electron configuration table." Please fix this oversight. RowanDreamer (talk) 04:11, 4 October 2023 (UTC)[reply]