CHEM 101 Lecture Notes - Lecture 1: Atomic Number
Document Summary
Atom- submicroscopic particle that cannot be broken down into simpler substances by chemical means. Molecule- particle that forms when two or more atoms bind. The properties of matter are determined by the properties of molecules and atoms, understanding matter is to understand the atoms and molecules that compose them. Understand the difference between an element or compound. Element- substance formed from only one type of atom. Compound- substance formed when two or more elements are chemically bonded. Pure substance- contains only one type of matter. Heterogenous mixture- the individual substances in the mixture can be detected. Homogenous mixture- the individual substances in the mixture cannot be detected. Identify and name the first 20 elements in the periodic table. The number above each symbol is called its atomic number. Subscript indicates the ratio of the atoms of the elements in a compound.
