John Dalton's Early Life

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.

Democritus of Abdera was a greek philosopher born around 460 BC, a cheerful and blissful man. He was one of the two founding fathers of the Atomic Theory. His thought process on the theory, was that matter was comprised of tiny building particles called atoms. This theory was widely questionable at this time. As people were not very well accustomed with accepting new ideas, and/or new concepts of philosophy and science. This theory was only partially correct, and as scientist of the more modern age began to look deeper into Democritus’s work, they begin to make new theories and hypothesize new ideas about the atom. Which later on, would lead to the development of the atomic theory and the most accurate description of the atom with the work of Niels Bohr.

-Henry Gwyn Jeffreys Moseley- Worked with Ernest Rutherford, experimented with 38 metals, he found that the positive charge of each element’s nucleus increased by one from element to element as they were arranged in Mendeleev’s periodic table, lead to modern definition of atomic number (# of protons in atom’s nucleus) and the recognition the

  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).

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

The atomic mass of sodium is 23. The number of moles in 46g of sodium is ________.

Introduction Isotopes are atoms of the same atomic number having different masses due to different numbers of neutrons. The atomic mass of an element is the weighted average of the masses of the isotopes of that element. The weighted average accounts for both the mass and relative abundance of each isotope as it occurs in nature. The purpose of this lab was to discover the properties of isotopes using types of M&Ms as isotopes of a fictitious element. If the properties of M&M isotopes can be discovered, the the properties of real isotopes can be more easily understood.

Over the course of the last 5000 years, mankind’s knowledge has been constantly advancing. Chemistry, a branch of science, has experienced a tremendous leap and expansions since ancient Greek civilization. One of the major breakthroughs in the advancement in Chemistry was the creation of the Atomic theory, which laid a foundation for the modern-day Chemistry and future of science. The Atomic theory introduced the idea of atoms, which are defined as the discrete units of matter. There are five key scientists that significantly contributed to the Atomic model over a span of thousands of years. They are: Democritus, John Dalton, J.J. Thompson, Ernest Rutherford, and Niels Bohr.

Before really discussing what atoms were, why they are important, and so on. We began talking about the scientists that contributed to the study of atoms. The main scientist that we discussed were Democritus, Rutherford, Thomson, Bohr, Dalton, Heisenberg, and Chadwick. Prior to taking chemistry I only knew about Democritus, the Greek philosopher who developed the modern atomic model, and Dalton, who further developed Democritus’s model of the atomic model, but I wanted to know more about the other scientist. That night I went home and did research on the other scientist. This led me to finding out very interesting information on the other scientist and having a deeper understanding on what part of their research is still relevant today. The extra research I did on the scientist was a just a small scale example of talking my education into my own hands and getting a deeper understanding of particular

A man by the name of William Crookes was one of the main contributors to the new fields of physics and chemistry that emerged in the late 19th century. Crookes’ analysis of the photographic process in the 1850s inspired his work in the science of spectroscopy. Using techniques of spectroscopy Crookes discovered the element thallium. His efforts in discovering the weight of thallium in an evacuated chamber led to his research in vacuum physics.

- 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

John Dalton was an English chemist, meteorologist and physicist. John Dalton was one of the first scientists to use homemade instruments to make weather observations. He recorded over 20,000 weather observations over a period of 57 years,(Retrieved from Infobase Learning). His fascination for the weather and atmosphere pursue him to research the nature of gases, which in turn lead him to his biggest accomplishment. He built the atomic theory, after two centuries, this theory still remain valid in the field of modern chemistry. John Dalton is considered to be the father of modern atomic theory.

Dalton was the son of a Quaker weaver. When only 12 he took charge of