Atomic symbol blog

Key Events in our Understanding of the Structure of the Atom and Matter

By l26
  • Isaac Newton

    Isaac Newton
    Proposed a mechanical universe with small solid masses in motion.
  • Antwan Lavoisier

    Antwan Lavoisier
    Lavoisier formulated the law of conservation.
  • Joseph Priestly

    Joseph Priestly
    First to isolate elemental oxygen
  • Henri Becquerel

    Henri Becquerel
    While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays
  • JJ Thomson

    JJ Thomson
    For years scientists had known that if an electric current was passed through a vacuum tube, a stream of glowing material could be seen; however, no one could explain why. Thomson found that the mysterious glowing stream would bend toward a positively charged electric plate. Thomson theorized, and was later proven correct, that the stream was in fact made up of small particles, pieces of atoms that carried a negative charge. These particles were later named electrons.
  • James Chadwick

    James Chadwick
    Discovered the Neutron
  • The Interaction of Elementary Particles

    The Interaction of Elementary Particles
    Sumi Yukawa theorized that protons and neutrons in the nucleus attract one another by exchanging mesons.
  • Enrico Fermi

    Enrico Fermi
    Enrico Fermi achieved the first self sufficient chain reaction and thereby initiated the controlled release of energy. In doing so he helped take the first major steps towards making feasible, the building of the atomic bomb.
  • The Quantum Theory

    The Quantum Theory
    Wolfgang Pauli's came to the conclusion that no two electrons in an atom can have the same four quantum numbers
  • Marie Curie's Hypothesis

    Marie Curie's Hypothesis
    Marie’s hypothesis was revolutionary as it shifted the scientific understanding of that time. Before her hypothesis scientist believed that the atom was indivisible and undivided however through her hypothesis which stated that:
    "The emission of rays by uranium compounds could be an atomic property of the element uranium--something built into the very structure of its atoms."
    She realised and proved that there was a complex inner structure or immense energy stored in atoms