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Plato was a Geek philosopher. He discovered the atomic theory where geometric from serve as atoms. -
Democritus believed that atoms were uniformed, hard, solid, indestructible, incompressible, and that they moved in infinite numbers through empty space until they stopped. -
Aristotle was a Greek philosopher. He introduced the four bodies; fire, water, air, and earth and said that these bodies produced every substance on Earth, but that theory was proven wrong later. -
Lavoiser is most known for his discovery of oxygen and its role in combustion. He also helped create the metric system, helped reform the chemical nomenclature, wrote the first list of elements, and discovered that mass always remains the same. helped construct the metric system, wrote the first extensive list of elements, and helped to reform chemical nomeclature -
Alchemists believed that all metals were formed from the two principles mercury and sulfur. -
John Dalton was an English chemist, physicist and meteorologist. He introduced the atomic theory, which states that all matter is composed of atoms. -
If arranged according to increase in atomic weight, the chemical elements with similar physical and chemical properties occur after each interval of seven elements. Create by chemist J.A.R. Newlands in 1865 -
Mendeleev arranged the elements into organized groups to the elements, after realizing the properties of an element and their atomic mass were related. -
Discovered by Heinrich Rudolf Hertz. When electrically charged particles are released from a material when it absorbs electromagnetic radiation. -
Discovered by Henri Becquerel. This was an accidental discovery. He put uranium crystals and photographic plates, from different experiment, into drawer and when he opened it later, it had become radioactive. -
Discovered by J.J. Thomson. While experimenting with cathode ray tubes, Thomson discovered that all atoms contain electrons, tiny negatively charged subatomic particles. -
Ernest Rutherford discovered the proton. During his research, he created a nuclear reaction which led to the splitting of the atom, which led him to his discoverv of protons. -
The theory that ight bulb filaments should be heated to a temperature of about 3,200 kelvin to make sure that most of the energy is emitted into visible waves. -
Discovered by J.J. Thompson. The model shows the electrons as negatively charged particles in a sea off positive charge. The structure of the model resembles the English dessert, plum pudding. -
Alpha particles, which are negative, hit a piece of gold foil. Most of the particles went right through, showing that the gold atoms were mostly empty space. -
Robert Millikan was a physicist who is most known for discovering the elementary charge of an electron using the oil-drip method. -
created by Niels Bhor. the model shows the electrons orbiting around the nucleus of an atom. This model can also be called the planetary model of an atom. -
Mosley discovered that the atomic number is positive charges in the atomic nucleus. He discovered the relation between atomic numbers nd wave-length. -
Discovered by Robert Millikan he disovered the charge of the electron by using the oil-drop experiment -
Discovered by Erwin Schrödinger. An equation that is a linear differential equation that governs the wave function of a quantum-mechanical system. -
This principle states that We cannot know both the exact speed and the position of a particle -
Discovered by James Chadwick. He discovered that the core of an atom contained uncharged particles, neutrons.