-
600 BCE
The alchemist
Alchemy is an ancient practice, covered in mystery and privacy. Its practitioners mainly sought to turn lead into gold, a pursuit that has apprehended the imaginations of people for thousands of years. His thoughts were dominated however by a more well-known/famous philosopher, Aristotle, who proposed that all matter was made of four elements, earth, air, water and fire.Alchemy was based on the belief that there are four basic elements in nature: air, fire, water and earth. -
Period: 600 BCE to 501 BCE
The alchemist
-
460 BCE
The classical elements (Democritus)
One of the Greek philosopher who believed that the small unit could be divided, it is called an element. Democritus greatest contribution to the modern science was arguable to atomic theory. He discovered that an atom can't be broken into a smaller part. Between atoms, there lies an empty space and there are indestructible.Featuring tiny particles, always in motion interacting through collisions. -
Period: 460 BCE to 370 BCE
The classical elements
-
Joseph Proust
Joseph Louis Proust was a French chemist. He was unsurpassed recognized for his discovery of the law of constant alignment in 1794, stating that chemical compounds always syndicate in constant proportions. Proust is best known as an analytical chemist, mainly for his enunciation of the commandment of definite proportions. His devising and experimental protest of this law was entirely concerned with inanimate binary compounds, such as metallic oxides. -
-
John Dalton
John Dalton was a English chemist, Physicist and meteorologist. He was best known for, introducing the atomic theory for his research into colour blindness sometimes referred back to as Daltonism in his honour. His atomic theory anticipated that all matter was composed of atoms, imperishable building blocks. While all atoms of an element were identical, different elements had atoms of divergent size and mass. Compounds are formed by a unification of two or more different types of atoms. -
Period: to
John Dalton
-
Antoine Lavoisier
Antoine Lavoisier is a French chemist, who was the first one to study the chemical reactions. Outcomes led to one of the vital laws of chemical behaviour the preservation of matter, which matter is maintained in a chemical reaction. He proposed the Combustion Theory which was constructed on inclusive mass measurements. He named oxygen (1778) and hydrogen (1783) and disapproving the phlogiston theory. He eased concept the metric system, widespread of elements, helped to chemical nomenclature. -
Period: to
Antoine Lavoisier
-
JJ Thomson
Thomson exposed the electron by experimenting with a Crookes, or cathode ray, tube. He established that cathode rays were undesirably charged. Thomson realized that the acknowledged the model of an atom did not interpretation for negatively or positively charged particles.Thomson advised that the atom was composed of diffuse positive charge with small negatively charged electrons detached throughout. Thomson’s reviewed model of the atom did not introduce new factors that would enable to decide. -
-
Ernest Rutherford
Ernest Rutherford is a New Zealand-born British physicist who came to be known as the father of nuclear physics. He experiment displayed that atoms comprised of an impenetrable mass which was encircled by mostly unfilled space - the nucleus. Rutherford's experiment exploited positively charged alpha particles. Which rebounded by the dense internal mass.Rutherford intended an experiment to use the alpha particles discharged a radioactive element as reviews to the hidden world of atomic structure. -
Period: to
Ernest Rutherford
-
James Chadwick
James Chadwick was an English physicist, who gained the 1935 Nobel Prize in Physics for his discovery of neutron. Chadwick is finest recognized for his detection of the neutron in 1932. A neutron is a subdivision with no electrical charge that, along with positively charged protons, varieties up an atom's nucleus. The proton had been projected as actuality the nuclear particle accountable for the positive charge of the nucleus and for some of the nuclear mass. -
