CHEM 1210 Lecture Notes - Lecture 2: Bohr Model, Digestion, Unified Atomic Mass Unit
Document Summary
Introduction: atoms- the smallest characteristic part of an element inside the nucleus are the, pr ot o n s (p^+)- 1 amu- relative charge: + (atomic mass unit- very small fraction of a gram) Outside the nucleus in the electron cloud: a1. Electrons (e^-)- 0 amu- relative charge: : element- a fundamental substance that cannot be broken down into simpler substances by chemical means. Modern definition: all atoms in the substance have the same number of protons: chemical symbols- indicates the number of protons in the atom, compounds- made of 2 or more elements chemically combined. Subscript indicates how much of each element d1. Ex) h20 2 hydrogen atoms and 1 oxygen: molecular formula- shows there are 2 h atoms and 1 o atom. Structural formula- lines represent connections between atoms: lewis structure- uses dots to represent non-bonded atoms, classification of matter a, physical and chemical properties.
