Aristotle 's Theory Of Atomos Theory

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.

he atom or Atomos, which means uncuttable or indivisible, took many years to get to our understanding now. Back then they didn’t have the technology that we have now like microscopes, to figure everything out. Some important people who helped were Greek philosopher Leucippus and his student Democritus. They were the first came up with the idea that matter is made up of of tiny particles. They thought that if you cut something in half a lot times, that you will eventually reach a particle that can't be cut anymore. The next big discovery in the atom didn’t come until hundreds of years later by James Dalton, who stated that atoms of different elements have different masses. Throughout Dalton's life as a chemist he had many theories of the

He is also best known for the theory that was created by himself. The theory of Democritus and Leucippus held that everything is composed of "atoms", which are physically, but not geometrically, indivisible; that between atoms, there lies empty space; that atoms are indestructible; have always been, and always will be, in motion; that there are an infinite number of atoms, and kinds of atoms, which differ in shape, and size. Of the mass of atoms, Democritus said "The more any indivisible exceeds, the heavier it is." But his exact position on weight of atoms is

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.

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

Thomson discovered the electron. He used a cathode ray tube (an electron gun) with a magnet and discovered that the green beam it emitted was made up of negatively charged particles. Thomson then determined that these negatively charged electrons needed something positive to balance them out. (Born, 2014)

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

Democritus, an Ancient Greek philosopher, is widely considered to be the founding father of the Atomic Theory. Democritus proposed that matter is composed of atoms, which move through empty space. He also proposed that atoms are solid, homogeneous, indestructible, and indivisible, and that different types of atoms have different kinds of sizes and shapes, which determine the properties of matter. Democritus and other Greek philosophers Leucippus and Epicurus, were among the first to propose the size, shape, and connectivity of atoms. Democritus theorized that iron atoms are solid with hooks (which locked them in place with each other, therefore creating a solid), water ‘atoms’ are smooth and slippery, (which caused them to be in a liquid state),

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.

He said that elements consisted of identical atoms that had the same mass and that compounds were atoms from different elements combined together. (The Doc.2014)

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

J.J. Thomson’s experiments using the cathode ray showed corpuscles and proved that the electron is a negatively charged particle and is located outside of the nucleus. By using the discharge tube, he determined how much heat the cathode tube generated. His plum

Aristotle was a Greek philosopher, believed there were only 4 elements; fire, water, air, and Earth. This idea was widely accepted for 2,000 years. Antoine Lavoisier is considered “father of modern chemistry” although he made a living as a tax collector. His view of having only 4 elements being the basis of the material world helped influence “alchemists”.

Dalton had come up with the atomic theory which said “that all matter is made of atoms, all atoms of a given element are identical in mass and properties, compounds are combinations of two or more different types of atoms, and a chemical reaction is a rearrangement of atoms.” we learned so much from this theory, we know that the atoms are not indivisible because they are made up of protons, neutrons, and electrons and we know that Daltons picture of the atom was different than what it actually is. The periodic law says that “physical and chemical properties of the elements recur in