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 + Cl 2 → 2NaCl

Ionic Bonds 2Na + Cl 2 → 2NaCl

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

Ionic Bonds Elements from the far right of the periodic table will form ionic bonds with elements from the far left of the table. WHY?

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

Dot diagrams: H

He

Dot diagrams: Li

Dot diagrams: Be

Dot diagrams: B

C

N

O

F

Ne

Dot diagrams: Na

Dot diagrams: Mg

Dot diagrams: Al

Dot diagrams: Si

Dot diagrams: P

S

Cl

Dot diagrams: Ar

Dot diagrams: K

Forming Ions

If Fluorine forms an ion, what will its charge be?

Forming Ions If Fluorine forms an ion, what will its charge be? F

Forming Ions If Fluorine forms an ion, what will its charge be? F

Forming Ions If Fluorine forms an ion, what will its charge be? F

Forming Ions If Fluorine forms an ion, what will its charge be? F -1

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

Forming Ions If Potassium forms an ion, what will its charge be? K

Forming Ions If Potassium forms an ion, what will its charge be? K

Forming Ions If Potassium forms an ion, what will its charge be? K

Forming Ions If Potassium forms an ion, what will its charge be? K +1

Forming Ions There 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.