Chemistry Chapter 4,25
Subject:
Chemistry [1]
Tags:
Physics [2]
Chemistry [3]
Particle physics [4]
Nuclear physics [5]
radioactivity [7]
Baryons [8]
Proton [10]
Atomic nucleus [11]
Isotope [12]
Atom [13]
Technology [14]
Lecture 2 (Chapter 4 & 25) Atomic Structure Democritus (400 BC) ? Postulated there must be some basic unit of matter that could not be divided any further. ? Basic unit ? atomos (Greek = indivisible) Dalton Dalton?s Atomic Theory ? All matter is composed of extremely small particles called atoms ? All atoms of a given element are identical having the ame size, mass and chemical properties. Atoms of a specific element are different from those of any other element ? Different atoms combined in simple whole number ratios to form compounds ? Ina chemical reaction, atoms are separated, combined, or rearranged ? Atoms cannot be created, divided into smaller particles or destroyed. Scientist and Experiments Cathode Ray Tube Experiments ? Plum pudding model ?