1. Describe the characteristics of an ionic bond.
2. State the octet rule.
3. Draw a Lewis dot diagram to show the valence electrons of an atom.
4. Distinguish between cations, anions, and polyatomic ions.
ionic bond covalent bond ionic compound cation anion octet rule monatomic ion polyatomic ion binary ionic compound empirical formula
Ionic bonds & Compounds:
Ionic bonding is the result of the attraction of oppositely charged ions (atoms) or polyatomic ions (atom groups). The attraction acts much like the static electricity that holds hair to a comb on a windy day or opposite poles of a magnet. Here are some simple rules for ion formation and naming.
The properties of ionic compounds are more similar to the nonmetals than the metals and include:
The octet rule was a major breakthrough in the understanding of chemical bonding. What is states is that atoms will gain or loose electrons to fill their valence orbitals. Or more simply stated. The atoms will loose or gain electrons to become more like the nearest noble gas. Here are some simple rules:
Lewis Dot Diagrams:
Lewis Dot diagrams are an easy way to display the 4 valence orbitals involved in bonding. The element name is abbreviated and dots are filled in around the element based on the number of valence electrons present. Here are the simple rules.
(hyperphysics.phy-astr.gsu.edu/ .../imgper/perlewis.gif)Types of ions:
Binary Ionic Compounds
The simplest of the ionic compounds are called binary ionic compounds. They are formed from the union of 2 ions (cation & anion). The bond is relatively strong and the ratios of cations to anions is related to the charge on each ion.
The empirical formula (chemical formula) tells us about the exact numbers and ratios in the ionic compounds. The empirical formula only lists elements in their reduced quantities.
Last modified: November 04, 2003