LECTURE 2.1 – IONIC BONDING

Today’s Learning Target• LT 2.3 – I can hypothesize the compound that

forms between two ions. Furthermore, I can discuss the role that electronegativity and ionization energy played in the formation of this ionic bond.

• LT 2.4 – I can explain how electrostatic attractions lead to the formation of visible salt crystals. In this explanation, I can incorporate the idea of electrostatic attraction, positive charge, and negative charge.

How are bonds formed?

I. Electrons and Bond Formation

• Bonds form due to the movement of electrons• Electrons can be either shared or transferred

between elements• Exchange occurs so elements can gain a full

Octet.

How do ionic bonds form?

Chemical Bonding

Ionic Bonds

Metallic Bonds

CovalentBonds

I. Ionic Bonds• Ionic Bond – A bond that forms between ions

as a result of the elements exchanging electrons.

• Formed between metals and non-metals• Bond forms due to cation – anion attraction

that results from transferring electrons

Ionic Bond Formation

II. Ionization Energy, Electronegativity and Ionic Bond Formation

• Ionic bonds form because an atom with a low ionization energy loses its electron an element with a high IE.

Ionic Bond Formation

How do monoatomic bonds form?

I. Element Vocabulary

• Subscript – The number in the lower right corner.

• Superscript – The number in the upper right corner.

Al3+3

II. Monoatomic Ionic Bonds

• An ionic bond that forms between 2 elements is known as a monoatomic ionic bond.

• When elements bond, they form a compound that has new properties.

• New compounds do not have a charge.

Class Example

• What is the compound that forms between calcium and fluorine?

Table Talk

• What is the compound that is formed between magnesium and phosphorus?

Stop and Jot

• What is the compound that is formed between sodium and nitrogen?

How do polyatomic bonds form?

Stuck Together

I. Polyatomic Ionic Bonds

• Sometimes, there are charged compounds of two non-metals.

• Known as polyatomic ions• These ions can form ionic bonds with other

elements

Class Example

• What is the compound that would form between aluminum and SiO3

2-

Table Talk

• Determine the ionic compound that forms between barium and OH-

Stop and Jot

• Determine the ionic compound formed between cesium and CO3

2-.