CHEM 130 Lecture Notes - Lecture 3: Atomic Number, Chlorine, Mass Number
Document Summary
Chem 130: general chemistry: macroscopic investigations and reaction principles - Provided the basic theory of modern chemistry. All matter whether element, compound, or mixture is composed of. Postulates of dalton"s atomic theory small particles called atoms. An explanation of the structure of matter in terms of different combinations of very small particles. All matter is composed of individual atoms. An atom is defined as an extremely small particle that retains its identity during chemical reactions. An element is a type of matter composed of only one kind of atom, each of a given kind having the same properties. Atoms of a given element have a characteristic mass. A compound is a type of matter composed of atoms of 2+ elements chemically combined in fixed proportions. The relative numbers of any two kinds of atoms in a compound occur in simple rations. Water (h2o) consists of hydrogen and oxygen in a 2:1 ratio.
