The Periodic Table, Molecules and Molecular Compounds, and Ions and Ionic Compounds (Sections)Using the periodic table to guide you, predict the chemical formula and name of the compound formed by the following elements: (a) Ga and F, (b) Li and H, (c) Al and I, (d) K and S.
Chapter 3: Elements and the Periodic Table 3.1 The Building Blocks of Matter A. The Atom –Dalton’s atomic theory (1802) • An _atom_is the smallest particle of matter_. • An _atom is the smallest unit of an element . • Atoms of one element are _(mostly) identical__. • Atoms one element are _different_ from atoms of _another element_. B. Elemental Symbols • A symbol represents each element. • Some are easy: C H Carbon Hydrogen • Some are harder to see: Au Sn Gold Tin • Know name = symbol for #1 - 20 for Test 1__; Know the entire list from Moodle for __Test 2__. C. Compounds are made up of __2 or more elements_ joined by chemical bonds__. H2O C2H6O • The smallest unit of a compound is a _molecule_. • _Subscripts_ are whole numbers that show _how many_ __atoms___ of each element are present in each molecule of the compound. Bad: HO1/2 C0.33HO0.18 • All molecules of a compound are _identical_. D. Smallest Form 1. Most elements are _monoatomic__: the smallest form is a singular atom. 2. __Diatomic Elements__: elements whose smallest unit is a __2 atom molecule_ Diatomic Elements: H, N, O, F, Cl, Br, I H – H 1 molecul