Lesson 15 Part II:

Ionic Bonding &

Intro to Lewis Structures

Do Now: Follow all instructions to earn 5 points for participation grade.

• Take your CJs out – write info down from board.

• Keep CJs out and open on desk.

• Take out your HW – boxes 4 and 5 in Lesson 15 Part II notes.

• Answer the following question(s) in a box on your ‘do now’ sheet:

1. Brainstorm a list of things you know about polyatomic ions.

2. What is this separation technique shown below? What kind of mixtures are

separated with this technique? How?

Date: 1-10-18

7B, 7Pb

Check your HW – Boxes 4 & 5 in Lesson 15 Part II notes

2(+1) + 1(-2) = 0

1(+2) + 1(-2) = 0

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

1(+2) + 2(-1) = 0

Gold (I) sulfide

Mercury (II) sulfate

Manganese (II) phosphate

Cobalt (II) bromite

Ammonium fluoride

CaCO3

Mg(NO3)2

(NH4)2SO4

Na2SO4

Fe(OH)3

Cr3(PO4)2

NaClO

NaClO4

Review – halogen polyatomic ions

ClO-

hypochloriteClO2

-

chlorite

ClO3-

chlorate*most common

ClO4-

perchlorate

One MORE

oxygen

One LESS

oxygenOne LESS

oxygen

base name

for chlorine

Review – halogen polyatomic ions

F Cl Br I

One oxygen

“Hypo___ite”

Two oxygens

“___ite”

Three oxygens

“___ate”

Four oxygens

“per___ate”

ClO-

hypochlorite

ClO2-

chlorite

ClO3-

chlorate

ClO4-

perchlorate

FO-

hypofluorite

FO2-

fluorite

FO3-

fluorate

FO4-

perfluorate

BrO-

hypobromite

BrO2-

bromite

BrO3-

bromate

BrO4-

perbromate

IO-

hypoiodite

IO2-

iodite

IO3-

iodate

IO4-

periodate

All have an

overall charge

of 1-

Review “Practice with Orbital Diagrams”:

Turn to p.5 in Lesson 15 Part II notes

Review “Practice with Orbital Diagrams”:

Review “Practice with Orbital Diagrams”:

Be will lose these

valence electrons

How many fluorine atoms

will accept Be’s valence

electrons?

F has one spot to fill

2s now empty.

1s2 is considered a full outer shell.

Two fluorine atoms each accepted one

electron. 2s22p6 is a full outer shell.

Review “Practice with Orbital Diagrams”: BeF2

Review “Practice with Orbital Diagrams”:

Review “Practice with Orbital Diagrams”:

Li will lose this

valence electron

O has two spots to fill

Review “Practice with Orbital Diagrams”:

2s now empty.

1s2 is considered a full outer shell.

One oxygen accepted two electrons, one

from each Li atom.

2s22p6 is a full outer shell.

Li2O

Intro to Lewis Dot Symbols:

Guidelines:

- dots are used to represent electrons

- only valence electrons are included

- cations no dots & and positive charge

- anions will have a filled valence shell (8) & a negative charge

STEPS:

1. Find the number of valence electrons (A group elements = group number)

2. Write the element symbol.

3. Draw dots starting at the top of the symbol and continue clockwise.

Intro to Lewis Dot Symbols:

EXAMPLES

1.Tin

Group # ____ How many valence electrons? ______4A 4

Sn

Now move

clockwise

EXAMPLES

2. Sulfur

Group # ____ How many valence electrons? ______6A 6

S

Cu Br B

Ne H Se

PRACTICE:

Cu Br BTransition metals have 1

or 2 valence electrons

PRACTICE:

Cu Br B

Ne H Se

PRACTICE:

Lewis Structures are also used to show ions and ionic compound

formation.

Lewis Structures are also used to show ions and ionic compound

formation.

Lewis Structures are also used to show ions and ionic compound

formation.

Lewis Structures are also used to show ions and ionic compound

formation.

Ffluorine

Ffluoride

-gains an

electron

#1

8 valence electrons =

full outer shell

Nasodium

Nasodium ion

+loses an

electron

#2

Cation has a full outer shell – we

don’t draw the electrons for cations

Ooxygen

Ooxide

2-gains two

electrons

#3

8 valence electrons =

full outer shell

PRACTICE:

Selenide Beryllium ion Barium ion

Potassium ion Nitride Phosphide

PRACTICE:

Selenide

Se2-

Beryllium ion

Be2+

Barium ion

Ba2+

PRACTICE:

Selenide

Se2-

Beryllium ion

Be2+

Barium ion

Ba2+

Potassium ion

K

Nitride

N

Phosphide

P+ 3- 3-

EXAMPLE: Draw how an ionic compound would from between Li and O to

form Li2O

Each Li atom will

donate their one

valence electron.

Li

Li

EXAMPLE: Draw how an ionic compound would from between Li and O to

form Li2O

Oxygen needs two

electrons to have

a full outer shell

Each Li atom will

donate their one

valence electron.

Li

Li

O

EXAMPLE: Draw how an ionic compound would from between Li and O to

form Li2O

Oxygen needs two

electrons to have

a full outer shell

Each Li atom will

donate their one

valence electron.

Li

Li

O1+

1+

2-

Li1+

Li1+

O....

.... 2-

#2 PRACTICE:

Draw how an ionic compound would from between Ca and F to form CaF2

Ca F2+

-

Ca2+

F....

.... -

F-

F.... .... -

Alkaline earth

ion

Fluoride ion

#3 PRACTICE:

Draw how an ionic compound would from between Na and Cl to form NaCl

Na Cl1+

-

Na1+

Cl....

....

-

Homework: Parts I, II, III under “Review & Practice” in Lesson 15 Part 2.

Element # of electron

shells

Group

number

# of valence

electrons

Predict the ion it

will form:

Metal, nonmetal,

metalloid?

Na 3 1A 1 Na+ metal

K

Sr

B

P

Cl

Kr