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<p>The arrangement of elements in a summary table was celebrated in 2019 on the occasion of the 150th anniversary of the publication of Mendeleev’s early Periodic Table. This review traces the subsequent developments that led to the formulation of Mendeleev’s later Periodic Table in 1872, highlighting the pivotal contribution of another key figure, Julius Lothar Meyer. Both chemists had attended the Karlsruhe Congress in September 1860, where Stanislao Cannizzaro presented his influential theory for determining atomic weights, an essential step toward systematic classification. Building on these foundations, Mendeleev and Meyer developed their respective approaches to organizing the Periodic Table, including the prediction of as-yet-undiscovered elements. A subtle yet important distinction emerges in their perspectives: while Meyer chose to reserve a restricted role for prediction, Mendeleev had the boldness to explicitly describe both the presumed chemical properties and the expected atomic weights of the missing elements, and even went so far as to assign them provisional names. Some of the missing elements (e.g., Ga, Sc, and Ge) were discovered soon after, whereas others, such as Tc (from the Greek <i>technetos</i>, meaning “artificial”) and At (from the Greek <i>àstatos</i>, meaning “unstable”), were produced artificially much later.</p>

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Lothar Meyer’s contribution to the transition between the early (1869) and later (1872) formulation of Mendeleev’s periodic table

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Fabio Arnesano,
  • Giovanni Natile

摘要

The arrangement of elements in a summary table was celebrated in 2019 on the occasion of the 150th anniversary of the publication of Mendeleev’s early Periodic Table. This review traces the subsequent developments that led to the formulation of Mendeleev’s later Periodic Table in 1872, highlighting the pivotal contribution of another key figure, Julius Lothar Meyer. Both chemists had attended the Karlsruhe Congress in September 1860, where Stanislao Cannizzaro presented his influential theory for determining atomic weights, an essential step toward systematic classification. Building on these foundations, Mendeleev and Meyer developed their respective approaches to organizing the Periodic Table, including the prediction of as-yet-undiscovered elements. A subtle yet important distinction emerges in their perspectives: while Meyer chose to reserve a restricted role for prediction, Mendeleev had the boldness to explicitly describe both the presumed chemical properties and the expected atomic weights of the missing elements, and even went so far as to assign them provisional names. Some of the missing elements (e.g., Ga, Sc, and Ge) were discovered soon after, whereas others, such as Tc (from the Greek technetos, meaning “artificial”) and At (from the Greek àstatos, meaning “unstable”), were produced artificially much later.