Atom History Essay An Atom is a basic unit of matter that consists of a dense, central nucleus surrounded by a cloud of negatively charged electrons. The Atom was theorized by a man named Democritus of Abdera, Thrace in between c.a 460 BC - ca. 370 B.C. Atom is derived from the Greek word “atomos” , which means to be uncuttable. He had a theory that everything is composed of “atoms”, which he believed that these minuscule objects are indivisible, indestructible and have and always been in motion, had a void that exists between atoms, they are solid, homogeneous, and differ in size, shape, mass, position, arrangement, etc. Democritus identified all of these qualities by using the analogies from our sense experiences.
In the early 1800
One of his best researches was for his Model of the Atom, commonly named The Bohr Model. In his version of the Model the neutrons and protons occupy a dense central region called the nucleus and the electrons orbit the nucleus much like planets orbiting the Sun. It is sometimes also called the planetary model because he theorized that the attractive gravitational force in a solar system and attractive electrical force between the positively charged nucleus and the negatively charged electrons in the atom are mathematically of the same form. As compared Below. V.S
Another Great Austrian physicist in 1926 named Erwin Rudolf Joself Alexander Schrodinger, also created his own view of Atom. He improved atomic models to a whole other level. Schrodinger used the new quantum theory to write and solve a mathematical equation describing the location and energy of an electron in a Hydrogen atom.Thus the quantum mechanical model was born. His view of the atom can be seen as “layers within layer” in terms of the electron shells. While not an accurate physical picture of what is happening with the electrons, it does allow to be visually grasp an otherwise concept. He says that each electron shell is made of a number of sub-shells. ( the number of sub-shells in a shell depends on what the shell number is). In a picture it looks like this:
The last and final physicist in this Atomic Theory is named Sir James Chadwick, CH, FRS, of the United Kingdom. In 1932, Chadwick proved