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The INTERNET Database of Periodic Tables

There are thousands of periodic tables in web space, but this is the only comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Mark R. Leach Ph.D.

Use the drop menus below to search & select from the more than 1100 Period Tables in the database:

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2019

Group 3 of The Periodic Table

There are several ways in which the 'common/modern medium form' periodic table are shown with respect to the Group 3 elements and how the f-block is shown. Indeed, there is even some dispute about which elements constitute Group 3.

There are three general approaches (also see Scerri's take and Thyssen's view):

Which one is 'better'?

The general feeling amongst the knowledgeable is that leaving a gap is not an option, so it comes down to:

Sc, Y, La, Ac     vs.     Sc, Y, Lu, Lr

René Vernon has looked as the properties of the potential Group 3 elements, including: 1st ionisation energies, densities, ionic radii, electron affinity, melting points & 3rd ionisation energies:

Upon reviewing the data, René's comment is that: "The net result is that the two options seem inseparable" and he proposes that IUPAC adopt the following periodic table numbering system:

Professor Sir Martyn Poliakoff's [of the Periodic Videos YouTube channel & Nottiningham University] take on this matter:

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What is the Periodic Table Showing? Periodicity

© Mark R. Leach Ph.D. 1999 –


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