chemistry timeline

By lpeck-26

  • Law of Constant Composition

    The Law of Constant Composition was formulated by Joseph Proust. It was created in 1754 and it is also called the law of definite proportions. The law states that if a compound is broken down into its constituent elements, the masses of the constitutions will always have the same proportions, regardless of the quantity or source of the original substance.

  • Atomic Theory

    The Atomic Theory was credited by John Dalton in 1766 and he made it for proposing the atomic theory. This theory explains several concepts that are relevant in the observable world.

  • Law of Conservation of Mass

    Law of Conservation of Mass made by Antoine Lavoisier in 1766. The conservation of mass stated that the total mass present before a chemical reaction is the same as the total mass present after the chemical reaction.

  • Law of Multiple Proportions

    The Law of Multiple Proportions was created by John Dalton. It was created in 1803. John Dalton stated that when two elements combine with each other to form two or more compounds, the ratios of the masses of one element that combine with fixed mass of the other are simple whole numbers.

  • Dalton's Atomic Theory

    Dalton's Atomic Theory was created by John Dalton. It was created in 1808. It stated that all matter was made up of small, indivisible particles known as atoms.

  • Discovering Electrons

    Discovering Electrons was discovered by J.J. Thompson. It was created in 1897. J.J Thompson discovered electrons by concluding that cathode rays are negatively particles that are located in all atoms.

  • The Plum Pudding Model

    The Plum Pudding Model was created by J.J. Thompson in 1904. It was the first scientific model of the atom with an internal structure. It was followed after his discovery of the electron.

  • Discovery of the Proton

    The Discovery of the Proton was created by Ernest Rutherford in 1909. He performed a series of experiments studying the inner structure of atoms using alpha particles. He used the Plum Pudding Model as a reference.

  • The Discovery of the Neutron

    The Discovery of the Neutron was discovered in 1933 by James Chadwick. He discovered a new type of radiation that consisted of neutral particles. Discovered that these neutral atoms come from the nucleus of the atom.