# Ionic Bonding.

## Presentation on theme: "Ionic Bonding."— Presentation transcript:

Ionic Bonding

Elements Goal = Stability
Elements want to be stable In order to be stable they need to fill their outermost energy level completely “Complete its octet” (oct meaning 8) When outer level is filled No Charge = Stable When outer level is not filled Charge = Unstable

How do we figure out and elements charge?
Charge is determined by how many electrons they need to gain or lose to complete their outer level Every element in a group has the same charge Example: All Halogens are -1 Logical Order Group 1 2 13 14 15 16 17 18 Charge +1 +2 +3 +/- 4 -3 -2 -1

Add the following charges to the triangles at the bottom of your periodic table

Lets look at Magnesium. What is its charge?
Lets look at Sulfur. What is its charge?

How can elements complete their octet?
2 Ways Ionic bonds One element gives/takes electron from another element Covalent Bonds Two elements share electrons 1. The two extreme cases of chemical bonds are covalent bonds and ionic bonds. 2. When one or more pairs of electrons are shared by two atoms, a covalent bond is created. 3. An ionic bond is a bond in which one or more electrons from an atom are removed and attached to another atom, resulting in positive and negative ions which attract eachother. 4.

Ionic Bonds Bond in which one or more electrons from one atom are removed and attached to another atom. It is when atoms transfer electrons One element gives electron One element takes electron

How does ionic bonding work?
Ionic Bonds occur between metals and nonmetals Opposite charges are going to attract Their charges will cancel out and become 0 0 = Stable Example: = 0

Lets look at an example Why does NaCl work as an ionic bond?

Na Cl-1 Opposites Attract *NaCl* Neutral and stable

How does the sharing work?
Na has the 1 lone electron to share in its outermost level Cl needs 1 to complete its octet Na will give 1 electron to Cl

Ionic Bonding Problems
Step 1: Draw Lewis Dot Diagrams; Draw an arrow showing where the electron is moved Step 2: Rewrite the elements with their charges Step 3: Write the final compound Step 4: Write the name of the compound

Naming Ionic Compounds
When you name a compound, you first put the metal and then the nonmetal. The nonmetal word would end in “-ide” instead of whatever it normally ends in So combining Na and Cl would be SODIUM CHLORIDE

Ionic Bonding Problem: Sodium and Sulfur
Step 1: Write Lewis dot with arrow Step 2: Write charges Step 3: Write Final Compound Step 4: Write Name

Example: Sodium and Sulfur
Step 1 Step 2 Na S-2 Na+1 Step 3 Na2S Step 4 : Sodium Sulfide