1. How does Chemistry word come ?
The first modern chemist was Robert Boyle (1627-1691). Though most famous for his work with gases, Boyle was also the first to disagree with the Greek idea of four elements in his book The Skeptical Chymist, published in 1661.
Chemistry is the scientific field involved with elements and compound composed of atoms , molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substance .
Fundamentally, chemistry is the study of matter and change. The way that chemists study matter and change and the types of systems that are studied varies dramatically. Traditionally, chemistry has been broken into five main subdisciplines: Organic, Analytical, Physical, Inorganic and Biochemistry etc .
In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them. … J.J. Thomson (1856-1940) first discovered electrons; small negatively charged particles in an atom. Then E. Rutherford (1871-1937) give his theory or model on atoms by an experiment ( Scattering of a-partical (a=alpha) by a gold foil .) . Then Neils Bohr (1885-1962) also give his theory or model on atoms .
This is periodic table which are made by scientists like J.J. Thomson ,E. Rutherford ,and etc many more .
Physics 