Today we will…Review last night’s homework

Take a daily Quiz

Continue learning about ionic compounds.

Homework:

Questions 3, 4, 5, and 6 on page 214

Homework3. What family of elements is

relatively unreactive, and why?

Homework3. What family of elements is

relatively unreactive, and why?

The noble gasses, group 18, because they have completely full or empty shells and their charges are neutral.

Homework4. Describe the formation of both

positive and negative ions.

Homework4. Describe the formation of both

positive and negative ions.

Positive ions form when atoms lose electrons.

Negative ions form when atoms gain electrons.

(An electron has a negative charge.)

Homework5. Predict the change that must

occur in the electron configuration if each of the following atoms is to achieve a noble gas configuration.

Homework5. a. nitrogen

Homework5. a. nitrogen

N

Homework5. a. nitrogen

N

Homework5. a. nitrogen

must add 3 electrons

N

Homework5. b. sulfur

S

Homework5. b. sulfur

S

Homework5. b. sulfur

S

Homework5. b. sulfur

must add 2 electrons

S

Homework5. c. barium

Ba

Homework5. c. barium

Ba

Homework5. c. barium

Ba

Homework5. c. barium

must lose 2 electrons

Ba

Homework5. d. lithium

Li

Homework5. d. lithium

Li

Homework5. d. lithium

Li

Homework5. d. lithium

must lose 1 electron

Li

Homework6. Draw models to represent the

formation of the positive calcium ion and the negative bromide ion.

Homework

Ca Br

Homework

Ca Br

Homework

Ca Br

-1+1

Homework

Ca Br

+2 -1

What happens to the extra electron?

Ca Br

+2 -1

Br Ca Br

+2 -1

-1

What happens to the extra electron?

What happens to these ions?

Br Ca Br

+2 -1

-1

What happens to these ions?

CaBr2

Daily Quiz

Daily Quiz

1. Of the following elements, which is the least reactive?

A. Lithium (Li)

B. Boron (B)

C. Carbon (C)

D. Oxygen (O)

E. Neon (Ne)

Daily Quiz

2. This dot diagram could represent which of the following elements?

A. Lithium (Li)

B. Boron (B)

C. Carbon (C)

D. Oxygen (O)

E. Neon (Ne)

X

Daily Quiz

3. When oxygen ionizes, what will be its charge?

A. +3

B. +2

C. neutral

D. -2

E. -3

Daily Quiz

4. Oxygen could form an ionic bond with which of the following elements?

A. Lithium (Li)

B. Carbon (C)

C. Nitrogen (N)

D. Fluorine (F)

E. Neon (Ne) .

Daily Quiz

1. Of the following elements, which is the least reactive?

A. Lithium (Li)

B. Boron (B)

C. Carbon (C)

D. Oxygen (O)

E. Neon (Ne)

Daily Quiz

1. Of the following elements, which is the least reactive?

A. Lithium (Li)

B. Boron (B)

C. Carbon (C)

D. Oxygen (O)

E. Neon (Ne)

Daily Quiz

2. This dot diagram could represent which of the following elements?

A. Lithium (Li)

B. Boron (B)

C. Carbon (C)

D. Oxygen (O)

E. Neon (Ne)

X

Daily Quiz

2. This dot diagram could represent which of the following elements?

A. Lithium (Li)

B. Boron (B)

C. Carbon (C)

D. Oxygen (O)

E. Neon (Ne)

X

Daily Quiz

3. When oxygen ionizes, what will be its charge?

A. +3

B. +2

C. neutral

D. -2

E. -3

Daily Quiz

3. When oxygen ionizes, what will be its charge?

A. +3

B. +2

C. neutral

D. -2

E. -3

Daily Quiz

4. Oxygen could form an ionic bond with which of the following elements?

A. Lithium (Li)

B. Carbon (C)

C. Nitrogen (N)

D. Fluorine (F)

E. Neon (Ne)

Daily Quiz

4. Oxygen could form an ionic bond with which of the following elements?

A. Lithium (Li)

B. Carbon (C)

C. Nitrogen (N)

D. Fluorine (F)

E. Neon (Ne) .

Ionic Compounds Form Crystals

Ionic Compounds Form Crystals

Ionic Compounds Form Crystals

Ionic Compounds Form Crystals

Ionic Compounds Form Crystals

Ionic Compounds Form Crystals

Ionic Compounds Form Crystals

Vocabulary

cation positively charged ion

anion negatively charged ion

cation positively charged ion

anion negatively charged ion

Cats have a positive impact on your life.

cation positively charged ion

anion negatively charged ion

Ants have a negative impact on your life.

formula unit the ratio of elements in an ionic compound

formula unit the ratio of elements in an ionic compound

Technically, this is one molecule of salt.

formula unit the ratio of elements in an ionic compound

Technically, this is one molecule of salt.

It has the formula:

Na95238507751895434357094Cl95238507751895434357094

formula unit the ratio of elements in an ionic compound

Technically, this is one molecule of salt.

It has the formula:

Na95238507751895434357094Cl95238507751895434357094

But we will just call it NaCl.

oxidation number

oxidation state

charge

These all mean the same thing.

Determining Charge

Determining ChargeHow do you know how many electrons an atom will want to take or give away?

Determining Charge

Determining ChargeElements in group 1 want to give away 1 electron.

Determining ChargeElements in group 1 want to give away 1 electron.

Determining ChargeElements in group 2 want to give away 2 electrons.

Determining ChargeElements in group 17 want to take

1 electron.

Determining ChargeElements in group 16 want to take

2 electrons.

Determining ChargeElements in group 15 want to take

3 electrons.

Determining ChargeTransition elements and metaloids can also form ions, but it’s complicated.

Determining ChargeThese one you would need to look up to see their charge.

Determining ChargeSome elements can have more than one charge. Iron can be Fe+2 or Fe+3.

You try some!

Write the formula for a compound of SODIUM and CHLORIDE.

You try some!

Write the formula for a compound of SODIUM and CHLORIDE.

NaCl

You try some!

Write the formula for a compound of LITHIUM and BROMIDE.

You try some!

Write the formula for a compound of LITHIUM and BROMIDE.

LiBr

You try some!

Write the formula for a compound of FLUORIDE and CESIUM.

You try some!

Write the formula for a compound of FLUORIDE and CESIUM.

CsF

What if the charges don’t balance?

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

Ba N

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

1. Find the charges.

Ba N

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

1. Find the charges.

Ba+2 N-3

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

2. Find the least common multiple.

Ba+2 N-3

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

2. Find the least common multiple.

Ba+2 N-3

2 x 3 = 6

Six electrons were transferred.

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

2. Find the least common multiple.

Ba+2 N-3

It takes 3 bariums to provide 6 electrons.

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

2. Find the least common multiple.

Ba+2 N-3

It takes 2 nitrides to

accept 6 electrons.

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

2. Find the least common multiple.

Ba3N2

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

3. The overall charge should be zero.

Ba3N2

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

3. The overall charge should be zero.

Ba3N2

Check your work.

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

3. The overall charge should be zero.

Ba3N2

Check your work.

3(+2) + 2(-3) = 0

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

The quick way:

Ba+2 N-3

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

The quick way:

Ba+2 N-3

Swap the numbers

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

The quick way:

Ba3 N2

Swap the numbers

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

The quick way:

Ba3 N2

Swap the numbers

What if the charges don’t balance?

What would be the formula for BARIUM NITRIDE?

The quick way:

Ba3N2

Swap the numbers

You try some!

Practice problems 7-11 on page 217