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Period: 460 BCE to 370 BCE
Democritus
Democritus, an ancient Greek philosopher, is known for developing the atomic theory. He said that all matter is composed of indivisible particles called atoms, which differ in size and shape. Democritus' ideas set the course for atomic theory in chemistry. Democritus' key contribution was the development of the atomic theory. He said everything is made of tiny, indivisible particles called atoms, each with specific characteristics. -
Period: to
Antoine Lavoisier
Antoine Lavoisier was a French chemist who is referred to as the "Father of Modern Chemistry." He made contributions to the understanding of chemical reactions and the conservation of mass. Lavoisier played an important role in the chemical revolution of the late 18th century.One of Lavoisier's most famous achievements was his work on the identification and naming of chemical elements. -
Period: to
John Dalton
John Dalton was an English chemist, physicist, and meteorologist who is known for his work on atomic theory and early contributions to the understanding of chemistry. Dalton's atomic theory, proposed in the early 19th century, was an advancement in the field of chemistry and set the course for atomic theory. -
Period: to
J.J. Thomson
J.J. Thomson was a physicist known for discovering the electron through his experiments with cathode rays. He proposed the "plum pudding" model of the atom, suggesting electrons were embedded in a positively charged sphere. Thomson's work changed the understanding of atomic structure and earned him the Nobel Prize in Physics in 1906. -
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Ernest Rutherford
Ernest Rutherford was a pioneering physicist known for the gold foil experiment, which led to the discovery of the atomic nucleus and the development of the nuclear model of the atom. His work set the course for modern atomic theory, and he also made contributions to the understanding of radioactivity, receiving the Nobel Prize in Chemistry in 1908. -
Period: to
Erwin Schrödinger
Erwin Schrödinger was an Austrian physicist who made important contributions to the development of quantum mechanics. He focused on understanding the behavior of subatomic particles, particularly electrons, within atoms. He also contributed to the concept of wave-particle duality, suggesting that particles like electrons can exhibit both wave-like and particle-like properties. -
Period: to
James Chadwick
James Chadwick was a British physicist who made a significant contribution to the understanding of atomic structure. He is best known for the discovery of the neutron, a subatomic particle with no electric charge. This helped complete the picture of the atomic nucleus, which includes protons (positively charged) and neutrons (no charge).