Scerri stuff indeed

Scerri stuff indeed – Non-chemists, and perhaps a few chemists, might have assumed that once all the holes in Mendeleev's Periodic Table were filled with modern discoveries and the lanthanides and actinides added, that the Table was forever immutable, a stone tablet to adorn high school chemistry lab walls, textbooks and websites unchanged forever more…well they'd be wrong, some chemists think it's time for a change.

2 thoughts on “Scerri stuff indeed”

  1. This is an outstanding article. Thank you for spending some time to summarize all of this out for folks. It’s a great help!

  2. Yes, that’s right there is debate over the placement of several elements including H, He, La, Ac, Lu and Lr.

    H can be placed in groups 1 or 17. Some believe it does not belong in any group (Peter Atkins for example). Some believe that it belongs in group 14 (half filled outer shell!).

    He is placed in the alkaline earths or group 2, in the very elegant left-step table due to Janet.

    Group 3 is variously shown as being Sc, Y, La, Ac or Sc, Y, Lu, Lr.

    In other words there is debate involving groups 1, 2, 3, 17 and 18.

    And these are substantial debates not just involving changing the shape or mode of representation of the table.

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