Classes of Binary Compounds
A binary compound is one that is formed from two types of elements.
Three possibilities exist.
metal + metal --→ metallic compound
metal + non-metal --→ ionic compound
non-metal + non-metal --→ covalent compound
The physical properties of each of these types of compounds is
Metals Ionic Covalent
Melting points variable high low
Electrical high low low
conductivity (solutions do conduct)
Hardness hard hard soft
Brittle malleable brittle brittle
GROUP 1 = 1+
GROUP 2 = 2+
GROUP 3 = 3+
GROUP 4 = ?
GROUP 5 = 3-
GROUP 6 = 2-
GROUP 7 = 1-
GROUP 8 = 0 (OCTET RULE)
Rules for predicting ionic fo