A New Unit

Ionic

Compounds

Homework:

•Read section 8.1

•Answer questions 3, 4, 5, and 6 on page 214

Do you remember what makes a “happy atom”?

Atoms want:

•Plus & minus charges to balance

•Electron shells to be exactly full

Do you remember what makes a “happy atom”?

Sodium is unhappy.

It has one more electron than will fit in its second shell.

Chlorine is unhappy.

It is missing one electron from its third shell.

Do you remember what makes a “happy atom”?

Sodium gives its extra electron to chlorine.

They are still unhappy. Why?

Sodium has a positive charge.

Chloride has a negative charge.

Do you remember what makes a “happy atom”?

But if they stay attached to one another, they can make each other happy.

In an ionic bond, the total charges balance out.

Do you remember what makes a “happy atom”?

Na Cl

Do you remember what makes a “happy atom”?

Na Cl

Do you remember what makes a “happy atom”?

Na Cl

Do you remember what makes a “happy atom”?

Na Cl

Do you remember what makes a “happy atom”?

NaCl

Do you remember what makes a “happy atom”?

NaCl

Do you remember what makes a “happy atom”?

2Na + Cl2 → 2NaCl

Ionic Bonds

2Na + Cl2 → 2NaCl

Ionic BondsElements from the far right of the periodic table will form ionic bonds with elements from the far left of the table.

Ionic BondsElements from the far right of the periodic table will form ionic bonds with elements from the far left of the table.

WHY?

Ionic BondsThe dot diagram will give you a good idea how the bond will form.

Dot diagrams:

H

Dot diagrams:

He

Dot diagrams:

Li

Dot diagrams:

Be

Dot diagrams:

B

Dot diagrams:

C

Dot diagrams:

N

Dot diagrams:

O

Dot diagrams:

F

Dot diagrams:

Ne

Dot diagrams:

Na

Dot diagrams:

Mg

Dot diagrams:

Al

Dot diagrams:

Si

Dot diagrams:

P

Dot diagrams:

S

Dot diagrams:

Cl

Dot diagrams:

Ar

Dot diagrams:

K

Forming Ions

Forming IonsIf Fluorine forms an ion, what will its charge be?

Forming IonsIf Fluorine forms an ion, what will its charge be?

F

Forming IonsIf Fluorine forms an ion, what will its charge be?

F

Forming IonsIf Fluorine forms an ion, what will its charge be?

F

Forming IonsIf Fluorine forms an ion, what will its charge be?

F -1

Forming IonsIf Potassium forms an ion, what will its charge be?

Forming IonsIf Potassium forms an ion, what will its charge be?

K

Forming IonsIf Potassium forms an ion, what will its charge be?

K

Forming IonsIf Potassium forms an ion, what will its charge be?

K

Forming IonsIf Potassium forms an ion, what will its charge be?

K +1

Forming IonsThere will be a daily quiz on this tomorrow.

Homework:

•Read section 8.1

•Answer questions 3, 4, 5, and 6 on page 214

• In question 3, remember to say why

• In question 6, when they say “draw models,” they mean dot diagrams.