BECQUEREL, Reflexions sur une théorie moderne, 1907

The long-held notion of the atom as an indivisible, stable particle, as proposed by Democritus, was challenged by these groundbreaking findings. Becquerel pondered this new reality, suggesting that atoms, rather than being eternally stable, might undergo modifications over time. However, the slow pace of these transformations or the rarity of conducive conditions could create the illusion of stability.

The 15 pages offprint with some orginals notes.