Atom Research Paper

1098 Words 5 Pages
History of the Atom
Democritus, a Greek Philosopher pioneered the ‘The history of Atom’. He pondered the outcome of cutting matter in to small pieces until it could no longer be cut. Democritus gave these pieces of matter were given the name “Atomos”, or “Atoms” as it is known today. The history of the atom has continuously evolved as more disclosures about the atom have been made in the course of the past several centuries. The atom was first thought to be the smallest possible unit of matter, however that perspective of the atom has steadily changed during the time into something fundamentally more intricate and astonishing.
Dalton’s Model
John Dalton, a teacher and lecturer based in England, was known for his augmentation on Democritus’
…show more content…
Thompson, an English physicist who played a major part in the development of the atom. He discovered the electron through his experiments and suggested a model for the structure of the atom, his atomic model was given the name, “The plum pudding” model was structured by using the cookies whereas, Thompson imagined the coco balls inside the cookies were electrons and the other part was positive charged as it shows on the Figure 2. (Ck-12 foundation, 2016). Thompson invented the “Vacuum Tube Experiments”to later discover the electron. His experiments indicated that there were negatively charged particles present in the electric current. The significance of this finding was that many other scientists at the time believed that an electric current comprised positively charged rays rather than negative (Ck-12 foundation, 2016). Thompson’s experiment concluded that the negative particles couldn’t be the fundamental units of matter because they are all alike, instead they should be parts of the atom. The name electrons was later given to the negative particles. Subsequent to his Thompson’s discovery of the electron, people realised that atoms were made up of even tinier particles than they had previously thought. Thompson identified that electrons had a negative charge and understood that matter needed to have a positive …show more content…
Niels Bohr, a Danish physicist created a more precise model that illustrated the fixed arragments of orbits of the electrons (Everythingmathscoza, 2016). His model suggested that electrons were in shells where the first shells had only two electrons, and following shells had eight each. However, a number of elements had outerchell of 7, which needed to be connected to the element which only consisted of one electron, so can form a different element, e.g. chlorine (Cl) which has 7 electrons on the outer shell and sodium which has 1 electron on outer shell both add up to form Sodiumchloride. Bohr 's model was an essential stride in the progression of the modern atomic theory. Bohr’s commenced research, that centered around electrons. He then found confirmation that the orbits of electrons are situated at static distances from the nucleus. This was a major discovery because Rutherford supposed that electrons orbit the nucleus at

Related Documents