Early Chemistry Pioneers
Ever wonder why matter doesn't disappear during chemical reactions? Thank Antoine Lavoisier and his Law of Conservation of Mass, which established that mass is neither created nor destroyed during chemical reactions—it just changes form.
Dmitri Mendeleev revolutionized chemistry by creating the first modern Periodic Table of Elements, organizing elements by their properties and even predicting the existence of elements not yet discovered. John Dalton gave us the foundation of modern chemistry with his Atomic Theory, proposing that all elements consist of tiny, indivisible particles called atoms that combine to form compounds.
The structure of the atom gradually came into focus through multiple scientists' work. J.J. Thomson discovered electrons and proposed the Plum Pudding Model with electrons embedded in a positive cloud. Ernest Rutherford's famous Gold Foil Experiment led to the Nuclear Model, revealing that atoms have a dense, positively-charged nucleus with electrons orbiting around it.
Science in Action: When Mendeleev created his periodic table, he confidently left gaps for undiscovered elements and accurately predicted their properties. Years later, elements like gallium were discovered that perfectly matched his predictions!
Neil Bohr refined our understanding with his Bohr Atomic Model, showing electrons orbit in specific energy levels. Einstein's work on the Photoelectric Effect demonstrated light's dual nature as both waves and particles, leading to his famous equation E = mc² that shows the relationship between energy and mass.
