1、Chapter 2 Atoms and the Periodic table Atomic Structure Atomic Number, Mass Number and Isotopes Nuclear Stability and Average Atomic Mass The Periodic Table The Mole and Molar Mass (from New Book) Molecular and Ionic Compounds Naming Inorganic Compounds Some Simple Organic CompoundsDemocritus (46037
2、0 BC) and other early Greek philosophers The material world is made up of tiny indivisible particles they called atoms, meaning “indivisible or uncuttable.” 1 Atomic Theory of MatterThe theory that atoms are the fundamental building blocks of matter reemerged in the early 19th century, championed by
3、 John Dalton. Daltons Postulates Each element is composed of extremely small particles called atoms. Daltons Postulates All atoms of a given element are identical to one another in mass and other properties, but the atoms of one element are different from the atoms of all other elements. Daltons Pos
4、tulates Atoms are neither created nor destroyed in chemical reactions. Atoms of an element are not changed into atoms of a different element by chemical reactions; Daltons Postulates Compounds are formed when atoms of more than one element combine; a given compound always has the same relative number and kind of atoms. 2 Discovery of atomic structureIt is a long story
