The Creation of the Modern Atomic Theory Essay

Concept 2.1 Matter consists of chemical elements in pure form and in combinations called compounds

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.

The Ancient Greeks were the firsts to speculate on the composition of matter. They thought that it was possible that individual particles made up matter.

the old view of atoms as the basic building blocks of the material world and Newtonian physics

  Then in 1661, Irish chemist Robert Boyle supported the philosophers’ theory of how chemical elements are made up of the simplest matter, backing the theory of how matter makes up all life and is the smallest living thing (Doc. 1). But a bombshell happened in 1803 when John Dalton backed up all three theories by discovering that atoms make up all matter, and chemical compounds are made of atoms (OI).

What is an atom? An atom is the basic building block of everything. An atom is made of electrons protons and neutrons and the number of protons determines the element. Back in the 1800’s this whole idea was unknown. In the 1800’s steam was starting to power everything. It became important to know how steam works, so you can learn to use it more effectively. It was this idea that drove Dalton to research the atom.

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.

He stated that this was a mysterious force but never continued his research on it. Then in 460 B.C. there was a philosopher named Democritus. Democritus and his mentor Leocippus posed the question that if he broke bread into multiple pieces how many would breaks would it take until there was no more bread. He then was able to make a few theories being all matter was created of atoms and atoms are solid but not invisible. However, there was a man named Aristotle and many other philosophers who disagreed with Democritus and said matter was composed of four main elements. Earth, fire, air, and water. For example, a liquid was made of water and a stone was made of rock. Therefore, Democritus’s theory “ was rejected by Aristotle, one of the most influential philosophers of Ancient Greece; and the atomic theory was ignored for nearly 2,000 years.”(

Democritus made the atomic theory widely known, which stated that the universe is composed of two elements: the atoms and the void in which these atoms exist and move. (More, 1646)

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),

I am going to be writing about democritus, J.J Thomson, E. Rutherford, N. Bohr, and Schrodinger. The reason why they are all in this report is because they contributed to the modern atomic model. First off Democritus is well known because he is the first person to think that there is a smaller thing than protons, neutrons, electrons. Next I’m gonna talk about J.J. Thomson, he discovered the electron, he found a way to make people understand why cathode rays were negatively charged, and he realized that the accepted model of an atom neither had a negative or positive charge.  E. rutherford also was a big part of the modern atomic model because he actually overturned Thomson's model when he did an experiment that helped people understand that the atom has a tiny and heavy nucleus and he made an experiment that used the alpha particles made by a radioactive element.

- The discovery of neutrons solved the mystery why atomic mass and atomic number are different, since neutrons added mass to the atom but don’t add any

In 5th century BC, a Greek philosopher named Democritus created the earliest form of the theory of matter. He was aware that two halves of a stone were overall identical, so he came to the conclusion that the stone would eventually become too small to cut if it continued to be separated. He referred to these minuscule pieces of matter as "atomos", the Greek word for indivisible. Democritus theorized that an atom differed in size and shape, as well as believing that they were in

An Atom is the the basic building block of all matter. Atoms are made up of Particles, called: Protons, neutrons and Electrons. Protons carry a positive charge, the neutron carry 's a neutral charge and the electron carry’s a negative charge. The Atom has two main parts the Nucleus and the Electron Shell. The Nucleus contains the Protons and Neutrons. The electron Shell Contains the The electrons.