Atom

The atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons (except in the case of hydrogen-1, which is the only stable nuclide with no neutrons). The electrons of an atom are bound to the nucleus by the electromagnetic force. Likewise, a group of atoms can remain bound to each other by chemical bonds based on the same force, forming a molecule. Chemical atoms, which in science now carry the simple name of "atom," are minuscule objects with diameters of a few tenths of a nanometer and tiny masses proportional to the volume implied by these dimensions. Etymology History of atomic theory Atomism The idea that matter is made up of discrete units is a very old one, appearing in many ancient cultures such as Greece and India. First evidence-based theory The structure of atoms The physicist J. Structure Subatomic particles

File:Atom diagram.png Atom Diagram Want to stay on top of all the space news? Follow @universetoday on Twitter A simple carbon atom. The image on the left is a basic atom diagram. This one shows the protons, neutrons, and electrons of a carbon atom. Each is in a group of six. Scientists have used atomic diagrams to explain the workings of the world for centuries. Basic chemistry explains the atom best. Earlier, I mentioned that there had been many atom models developed. The atom diagram is under constant revision as science uncovers more information about sub-atomic particles. Sources:WikipediaChemistry Help Tagged as: atom diagram The Atom As of July 1, 2013 ThinkQuest has been discontinued. We would like to thank everyone for being a part of the ThinkQuest global community: Students - For your limitless creativity and innovation, which inspires us all. Teachers - For your passion in guiding students on their quest. Partners - For your unwavering support and evangelism. Parents - For supporting the use of technology not only as an instrument of learning, but as a means of creating knowledge. We encourage everyone to continue to “Think, Create and Collaborate,” unleashing the power of technology to teach, share, and inspire. Best wishes, The Oracle Education Foundation

Fundamental Particle Structures "Fundamental" Particle Structures Introduction It is customary in science, after discovering some kind of order or pattern, to form a hypothesis and test it by experiment. Because particle physics is not my area of expertise, I was unable to determine an appropriate experiment, but the pattern presented here is impressive in its implications for fundamental particle structures. By publishing the material, I hope to bring it to the attention of those more knowledgeable in this area, and that someone else may develop appropriate experiments to test my hypothesis. Some Background Electrons and protons, primary constituents of atoms, were both "discovered" (i.e., some of their properties were measured) in the late 1890’s. Another type of particle that began turning up (starting with the positron in 1932) was the anti-particle, so-called anti-matter. As particles were discovered, they were put into one of three groups: Hypothesis The picture of particle physics has been confused. neutrino. .