The Discovery of Isotopes Francis William Aston and Antoine Becquerel An atom consists of a nucleus (of protons and neutrons) electrons in space about the nucleus. The Atom…
Elements, Atoms, and Compounds The Language of Chemistry CHEMICAL ELEMENTS - pure substances that cannot be decomposed by ordinary means to other substances. Sodium Bromine…
Chapter 2 Atoms and Elements Dalton’s Atomic Theory Postulates proposed in 1803 know for first exam Dalton’s Atomic Theory Postulate 1 An element is composed of tiny…