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Nov 24, 2013 · This document summarizes the development of atomic theory over time from ancient Greek philosophers to modern theory. It describes the key contributions of thinkers such as Democritus, Dalton, Thomson, Rutherford, Bohr, Schrodinger, and Chadwick. Their successive models proposed that atoms are small particles that join to form matter ...
- James Chadwick
James Chadwick was a British physicist born in 1891 who is...
- James Chadwick
Oct 27, 2013 · Atomic theory timeline. Oct 27, 2013 • Download as PPT, PDF •. 19 likes • 28,179 views. AI-enhanced description. R. ramatboy. The document outlines the major theories in the development of atomic theory from ancient Greece to the 20th century. It describes the key contributors including: Democritus who proposed that all matter is made of ...
Download ppt "History of the Atom - Timeline". Democritus (460 BC – 370 BC) Proposed an Atomic Theory (along with his mentor Leucippus) which states that all atoms are small, hard, indivisible and indestructible particles made of a single material formed into different shapes and sizes. Aristotle did not support his atomic theory Image taken ...
May 19, 2010 · James Chadwick was a British physicist born in 1891 who is known for discovering the neutron. He received several honors for his work, including the Nobel Prize in Physics in 1935. Chadwick served in World War I and was a prisoner of war. He also participated in the Manhattan Project during World War II. Chadwick's model of the atom focused on ...
Atom Model. ~460 BC. John Dalton. Started atomic theory. He said all matter is made up of atoms, atoms in a mass are identical, a compound is an combination of two or more different atoms, a chemical reaction is a rearrangement of atoms, and atoms cannot be created or destroyed. Billiard ball model, basically the same thing as Democritus.
Dalton’s Atomic Theory 1) Elements are made of tiny particles called atoms. 2) Atoms of one element are identical while atoms of different elements are different. 3) Conservation of atoms— rearrangement in RXN (Lavoisier previously stated this in terms of the Law of Conservation of Matter) 4) Different atoms form compounds in constant ratios.
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1. Elements are composed of small indivisible particles called atoms. 2. Atoms of the same element are identical. Atoms of different elements are different. 3. Atoms of different elements combine together in simple proportions to create a compound. 4. In a chemical reaction, atoms are rearranged, but not changed.
