John Dalton John Dalton was an English chemist, meteorologist, and physicist. He was born in September 6, 1766 and died in July 27, 1844. He is best known for his atomic theory, color-blindness studies and weather studies. Dalton’s atomic theory states five main points. It states that all matter is made of atoms. The second point is that atoms of the same element have the same mass and properties. The third point is that atoms cannot be created or destroyed. It also states that compounds are formed by a combination of two or more different kinds of atoms. The fifth point is that a chemical reaction is a rearrangement of atoms. Dalton’s theory is still valid in modern chemistry. Today we know that there are different kinds of atoms differing by their masses within an element known as isotopes. Isotopes of an element have the same chemical properties. Dalton’s theory became the theoretical foundation in chemistry. Joseph John Thomson Joseph John Thompson was born in December 18, 1856 and died in August 30, 1940. He was an English physicist. In 1897 Thompson discovered the electron in some experiments that he was doing to study the nature of electric discharge. He demonstrated that cathode rays were speedily moving particles. He measured their speed and specific charge, and concluded that these electrons were about 2000 smaller in mass. After his discovery, he was labeled as the most influential breakthrough in the history of physics after Sir Isaac Newton. Thomson also made a research on the nature of positive rays inn 1911. This helped in the discovery of isotopes. Thomson proved that isotopes could be broke by deflecting positive rays in electric and magnetic fields. This was later named mass spectrometry. In 1906 Thomson won a Nobel Prize for physics. He is considered as one of the greatest scientist in physics. Ernest Rutherford Ernest Rutherford was born on August 30, 1871, in Nelson, New Zealand and died in October 19, 1937 in Cambridge, United Kingdom. He was a physicist. Rutherford worked on radioactivity, coining the terms alpha and beta to describe the two different types of radiation emitted by uranium and thorium. He also observed that radioactive material took the same amount of time for half of it to decay, known as its “half life”. In 1907, Rutherford, Hans Geiger and Ernest Marsden carried out the Geiger-Marsden experiment, an attempt to examine the structure of the atom. The results of this experiment demonstrated the existence of the atomic nucleus, and it became an integral part of the Rutherford model of the atom. The Rutherford model of the atom was simplified in a symbol showing electrons circling around the nucleus. This symbol became popular, and it has been used by various organizations around the world as a symbol for atoms and atomic energy in general. In 1908, Rutherford was awarded the Nobel Prize in
Parents’ names: His father, Joseph Dalton, was a poor weaver. His mother is Deborah Greenup.
Siblings: (Brother) Jonathan and (Sister) Mary.
He was born with red/green color blindness. He was never married and devoted his life to science.
He was an educator (as early as 12 years old), scholar, chemist, meteorologist and journalist. He worked almost all his life in Manchester as a private tutor. (5)
Young Dalton went to John Fletcher’s Quaker school in Eaglesfield…
John Dalton was an English chemist and physicist. He is officially recognized as the first person to define the atom as the smallest particle of an element containing all of the elements properties. In 1909, John Dalton described atoms as solid, indestructible particles that make up all matter. John Dalton established a theory based on atoms of different elements being distinguished by differences in their weights. The theory had proposed different basic ideas. For instance, all matter is composed…
John Dalton (born September 6th 1766) was an English chemist, meteorologists and physicist. Besides his contributions to the atomic theory he also helped with research with color blindness.
In 1800, Dalton became a secretary of the Manchester Literary and Philosophical Society. This was the beginning of his is study into atomic theories.
Gas Laws – John Dalton during 1803 discovered and began research on how different gases such as methane, nitrogen dioxide and nitrous oxide. From…
Dalton’s work done?
John Dalton was born in Eaglesfield, England, on September 6, 1766 into a Quaker
family. Dalton attended school until the age of twelve and then became a teacher and
taught for the rest of his life. In 1794, Dalton published a scientific paper on
color-blindness, a disease that he personally suffered from. Due to his research color
blindness became know a daltonism.
Dalton became interested in sciences when a friend introduced him to meteorology. In
1787, Dalton started daily recordings…
I had to give out Nobel Prize to three of the scientists from my research, I would have to make a pretty tough choice. Should I choose who made the biggest discovery? Or should I choose the person who began the idea? My choices were Niels Bohr, John Dalton, and James Chadwick.
I chose Niels Bohr because the Bohr model is widely used today. Bohr discovered that the nucleus contains the protons and the electrons orbit around the nucleus. This is also compared to the planets orbiting around the sun…
Atom History Essay
An Atom is a basic unit of matter that consists of a dense, central nucleus surrounded by a cloud of negatively charged electrons. The Atom was theorized by a man named Democritus of Abdera, Thrace in between c.a 460 BC - ca. 370 B.C. Atom is derived from the Greek word “atomos” , which means to be uncuttable. He had a theory that everything is composed of “atoms”, which he believed that these minuscule objects are indivisible, indestructible and have and always been in motion…
only be divided up to a certain point.
1803 John Dalton
Contribution to atomic theory: Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass.
Description of how he discovered: He performed a series of experiments on mixtures of gases to determine what effect properties of the individual gases had on the properties of the mixture as a whole. While trying to explain the results of those experiments, Dalton developed the hypothesis that the sizes of the…
Aristotle disagreed with Democritus’s idea that you would end up with an indivisible particle. Because Aristotle had greater public influence, Democritus’s ideas were ignored for centuries. John Dalton (1803) Scientists knew that elements combined with each other in specific proportions to form compounds.
Dalton claimed that the reason for this was because elements are made of atoms. He published his own three-part atomic theory: 1) All substances are made of atoms. Atoms are small particles that…
I. Color deficiency in the human eyeball is a deficiency that is very out looked by many. People rely on colors, they are used in art, fashion designing or even just seeing a traffic light. Color blindness is when you have a narrow color spectrum, the spectrum is used to see light. If people do not see much light, then they are color blind. Many people believe a cure is not necessary, but research is still helpful. Medical doctors and scientists have thoroughly researched color blindness, a deficiency…
1. Pressure forces molecules of carbon dioxide to mix with water molecules until a can or bottle of soda is opened. Once the seal is broken, the carbon dioxide is allowed to escape because the pressure is released. This creates bubbles, or fizz.
2. Chemicals make up everything in the ordinary world, things we see and touch on an everyday basis. They are found in your liquid soap, the wood of your cabinets, and the utensils in your kitchen. Everything we eat or drink is composed of some sort of chemicals…