-
400
Greeks
In about 400 BC the Greek philosopher/scientist Democritus developed the theory that all matter was made of tiny units. The different properties of matter were caused by interactions between the tiny units, such as whether they were smooth or rough -
460
Democritus
460 BC,
370 BC
he was born 460 BC and died 370 BCDemocritus was an Ancient Greek philosopher born in Abdera, Thrace, Greece. A pupil of Leucippus, he was an influential pre-Socratic philosopher who formulated an atomic theory for the universe. -
500
Aristotle
Aristotle was born in 384 BC in Stagira, Greece. He lived and worked in Greece for almost all of his life. Aristotle's father, Nicomachus, was a physician, and taught Aristotle during his early childhood. He lived with his parents up until they died when he was about ten years old. After the tragic death of his parents, Aristotle lived with his guardian Proxenus. Starting at age 17 he went to a school called the Academy, in Athens, were he studied under Plato, whom he greatly admired. Aristotle -
John Dalton
John dalton was a English chemist who was born on September 6 1766 and died on July 27 1844. He was very important because he came up with the Atomic Theroy. -
JJ Thomson
JJ Thomson was a British Physicist who was Born on December 18 1856 and died on August 30 1940. The reason that he was well known was the he Discoverd Electrons and Isotopes in atoms. -
Ernest Rutherford
He was born on August 30 1871 and he died October 19, 1937. Source. Ernest Rutherford was a British chemist and physicist known as the father of nuclear physics. He received the Nobel Prize in 1908 for his "investigations into the disintegration of the elements." -
Niels Bohr
he was born on October 7, 1885 and he died November 18, 1962
Niels Bohr was a Danish physicist who contributed to understanding atomic structure and quantum mechanics. He won the Nobel Prize in Physics in 1922. -
James Chadwick
James Chadwick was born 20 October 1891 and died 24 July 1974 he was an English physicist who was awarded the 1935 Nobel Prize in physics for his discovery of the neutron in 1932. He was the head of the British scientists who worked on the Manhattan Project during World War II. He was knighted in 1945 for achievements in physics. -
Albert Einstien
Einstein was one of the fathers of the atomic age. He was one of the greatest scientists of all time. In 1905 Einstein contributed three papers. a German scientific periodical. Each of them became the basis of a new branch of physics. -
Electron Cloud Model
The electron cloud model is an atom model wherein electrons are no longer depicted as particles moving around the nucleus in a fixed orbit.
