Architects of the Micro-World

The understanding of the atom underwent a radical transformation following J.J. Thomson's discovery of the electron in 1897, which challenged classical physics. Thomson's 1904 "plum pudding" model proposed that atoms consisted of negatively charged electrons embedded within a sphere of uniform positive charge, much like raisins in a pudding.

However, a true revolution in atomic theory emerged from the work of Marie Skłodowska-Curie. Her pioneering research into the mysterious radiation emitted by uranium and thorium, which she termed "radioactivity," opened up a new scientific frontier. Curie's meticulous work, conducted under challenging conditions in Paris, led to the isolation of two new elements: polonium and radium.

Crucially, Curie's discovery provided Ernest Rutherford and his colleagues with a powerful tool: highly active sources of alpha particles, particularly from radium chloride. These precise instruments were essential for Rutherford's subsequent experiments, which aimed to penetrate the atom's electron cloud and probe its core.

Curie's fundamental hypothesis was that radioactivity was an intrinsic property of the atom itself, independent of its chemical or physical state. The radium she isolated exhibited an activity millions of times greater than uranium, emitting alpha, beta, and gamma rays. Unknowingly, Marie Skłodowska-Curie had created the world's most potent source of subatomic projectiles, laying the groundwork for Rutherford's exploration of nuclear structure.

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Maria zauważyła, że preparaty radowe emitują ciągły strumień energii oraz trzy różne rodzaje promieniowania, które roboczo sklasyfikowano ze względu na ich zdolność penetracyjną i zachowanie w polu magnetycznym na promienie alfa, beta i gamma.