Chemical Names and Formulas Overview •Metals and Non-Metals •Ions and Ionic Charges •Types of Compounds •Systematic Names -Writing Names and Formulas

Metals and Nonmetals Stairway Of Division on Periodic Table C, P, Se, I, Rn and to the right are non- metals B, Si, As, Ge, Sb, Te, At are metalloids All others are metals http://isbchem1.pbworks.com/w/page/9206122/Semi-Metals_E_Block

Ions Cations Positively Charged Atoms i.e. Na+ Anions Negatively Charged Atoms i.e. Cl-

TYPES OF COMPOUNDS Ionic Compounds Molecular Compounds Ionic means a metal and a non-metal (or cation and anion) These elements are NOT attached Writing Formulas • charges must balance so compound charge is neutral. Molecular Compounds • composed of molecules in which elements share electrons. • usually composed of 2 nonmetals. • these elements are attached

CHEMICAL FORMULAS Definition: i. e. NaCl shows the kind and numbers of atoms in the smallest representative unit of the substance. i. e. NaCl

WRITING FORMULAS AND NAMING IONIC COMPOUNDS Writing Formulas from Names • 1st word = CATION • 2nd word = ANION name with ide ending.

IONIC COMPOUNDS NaBr MgF2 Sodium Bromide Magnesium Fluoride

IONIC COMPOUNDS K + Cl- -> KCl Al3 + O2- -> Al2O3 Potassium Chloride Aluminum Oxide • notice ending of name is ide! K + Cl- -> KCl Al3 + O2- -> Al2O3

Polyatomic Ions Definition: tightly bound groups of atoms that behave as a unit and carry a charge. Example: SO32-, NO2-, ClO2-

Writing Formulas and Naming Compounds with Polyatomic Ions Ca2 + CO32- -> CaCO3 Ca(NO3)2 Calcium Carbonate Calcium Nitrate

Naming with Transition Metals First word = CATION Second word = ANION You need to determine what charge is on the transition metal if more than one exists.

Naming Transition Metals Copper (I) Oxide Cu2O

Writing Formulas with Transition Metals FeCl3 Cu2O FeCl2 Iron (III) Chloride Copper (I) Oxide Iron (II) Chloride

MORE ABOUT NAMING COMPOUNDS Your ability to name compounds and write formulas hinges on your ability to recognize whether a compound is Ionic or Molecular.

Naming Molecular Compounds Prefixes are used to show how many atoms are present in each molecule. mono, di, tri,tetra, penta, hexa, hepta, octa, nona, deca

Writing Molecular Compounds S4N2  Tetrasulfur Dinitride CO2  Carbon Dioxide • No mono prefix is used on first element • Di means two oxygen atoms

Naming Molecular Compounds (prefix + element name + root -ide) * No mono prefix is used on first element * The Greek prefixes for 1 through 8 are: mono-, di-, tri-, tetra-, penta-, hexa-, hepta-, octo- i. e. CO2 Carbon Dioxide i.e. N2O Dinitrogen Monoxide i.e. PCl3 Phosphorous Trichloride