The Scientists : The Physicists

John Dalton wrote the modern atomic theory, a fundamental component of that is, the mole ratios of elements in a compound will be small whole numbers.

This idea came from the findings of Democritus. His second conclusion was that all atoms of one type have the same mass and properties. Along with this point, Dalton understood atoms of different types had different masses and properties. Dalton’s fourth point consisted of the fact that chemical reactions do not create, change, or destroy elements, they are only rearranged in these reactions. The final point of Dalton’s theory was when different elements combine, they do so in some ratio of whole numbers. John Dalton was able to find mass numbers for twenty one different elements. The Law of Mass Conservation, created by Antoine Lavoisier, was supporting evidence to Dalton’s atomic theory. Next, J. J. Thompson contributed ideas to the existing theory. In 1898 he used a cathode ray and discharge tube to aid in the discovery of electrons. The electron has an antimatter counterpart. This counterpart is known as the positron, positrons have the same mass as electrons. J.J. Thompson was able to determine the existence of a + particle . He also founded the plum pudding model , this model showed negative particles scattered around a positive

John Dalton’s study of gases led him to question what these substances were really made of. Dalton wanted to solve the 2000 year-old mystery about atoms proposed by Democritus. He carried out countless chemical reactions. In 1808 published Dalton’s Law in his book A New System of Chemical Philosophy.

Essay twelve discusses a dark time for chemists. Suddenly, in the mid 1500’s chemists went from being priests and healers to witches and devils. Chemistry during this period is limited and men known as alchemists ran the show. These men used herbs metals and spices to create useful substances and herbal remedies. Helpful as they

John Dalton was a British chemist born in 1766 in England to a Quaker family. His family was poor and he was homeschooled until at age 15. He and his brother ran a school. He had the biggest effect on the atom. He was the first to bring back the idea of an atom and prove it. One reason Dalton’s discovery is important is without it

Around 2,500 years ago, Democritus and his partner Leucippus were the first ones to develop the atomic theory in written history. Their theory proposed that every kind of matter was made up of tiny particles, which were named atomos, which means that it is indivisible. This meant that Democritus and Leucippus thought there were little particles of everything, but, the next breakthrough in atomic theory wasn’t made until the early 1800s with a french chemist by the name of Antoine Lavoisier, he was the one who came up with the idea of the law of the conservation of mass, which states that matter stays the same even when it changes shape or form. Then, James Dalton said that all matter was made up of atoms, which were indivisible, and unbreakable.

The second main contributor toward the atomic structure was John Dalton. John Dalton was the one who brought the atomic theory talk back into play after 2000 years from Democritus. Dalton become fond of the atomic structure following his love from meteorology. He claimed that the forces of repulsion that caused pressure only were between the same atoms and the atoms inside a mixture had different weights and complexity. He then decided to calculate the atomic weights by determining the percentages of each composition in a compound. This allowed him to be able to

Hello everyone. The chemist that I chose is Percy Lavon Julian because I think that he is an

Around 1803 John Dalton, an English chemist developed the first useful atomic theory of matter. Amedeo Avogadro, the Italian chemist in 1811 published an article drawing the distinction between the atom and the molecule, which now is known as “Avogadro’s

With his experiment using a twelve-inch wide glass-burning lens in 1774, Priestley was the second to make the claim about the existence of oxygen and referred to this as the discovery of dephlogisticated air (American Chemical Society International Historic Chemical Landmarks). Hence, Priestley should be credited for the discovery of

Medieval alchemists “invented new ways to isolate, purify, and concentrate substances” (Challenging Limits). The alchemists established the value of analysis, which was fundamental to what became chemistry. First, it was Antonie de Lavoisier who used the techniques to move into the modern age of chemistry. He started by isolating elements and identifying the basic building blocks of nature. Even Humphry Davy was interested in learning the basic building blocks of nature. Until, in 1898, a new element was discovered that drew many questions to scientists. Radium had glowed in the dark and when photographed seemed to be giving off its own energy. At the time, no one knew that the radium was a deadly poison, which harmed human tissue. However, the effect on photographic plates that radium gave allowed humans to discover x-ray scans. These x-ray scans allow us to diagnose and treat diseases. With all of these elements taken into consideration, scientist began to ask themselves, “what are the elements made

Giacomo Luigi Ciamician was a well-known professor, Italian senate member, and Italian chemist who made brilliant discoveries and has many accomplishments that have impacted the way chemistry is practiced today. Ciamician was one of the founders of photochemistry. He discovered and experimented with solar energy, which is one of his greatest achievements. He also made discoveries with the periodic table that provoked questions from other scientists, causing a chain reaction of scientific breakthroughs. While Ciamician’s many discoveries mostly relate to chemistry, they vary greatly in content, showing that he was an individual of both intelligence and curiosity.

Dalton had his own concept about the understanding of atoms, since he couldn’t develop or enhance Democritus' theory. This was that all atoms of different elements can be “distinguished” from each other by the differences in the atoms weights. He shared his theory with other scientists and researchers during his lecture at the Royal Institution in 1803. His theory was based around the following key points: 1) Matter is made up of atoms; atoms are inseparable and can’t be destroyed. 2) Atoms of a certain element have the same mass and chemical properties.

The Daltons research papers changes, he began to study and observe the physical sciences: heat conduction, gas expansion by heat, the properties of light, the aurora borealis, and meteorology. These studies helped him establish The Atomic Theory. Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.Dalton's atomic theory also stated that all compounds were composed of combinations of these atoms in defined ratios.Dalton also postulated that chemical reactions resulted in the rearrangement of the reacting atoms. Terms atom The smallest possible amount of matter that still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons. atomic mass unit The standard unit that is used for indicating mass of an

he credit for finding oxygen is currently shared by three physicists: an Englishman, a Swede, and a Frenchman. Joseph Priestley was the first to distribute a record of oxygen, having made it in 1774 by focussing daylight on to mercuric oxide (HgO), and gathering the gas which fell off. He noticed that a light smoldered all the more splendidly in it and that it made breathing simpler. Obscure to Priestly, Carl Wilhelm Scheele had created oxygen in June 1771. He had composed a record of his disclosure yet it was not distributed until 1777. Antoine Lavoisier additionally asserted to have found oxygen, and he suggested that the new gas be called oxy-gène, which means corrosive shaping, since he thought it was the premise of all