27 28Valence Electrons and Periodic Basics

Starter

Practice:

Connection:Answer questions using Periodic Basics1. What patterns do you see?2. What do the vertical columns have in common?3. What do the horizontal columns have in common?4. What changes move across the table from left to right?

Exit:

Sep 14, 2015

Glue it in

after the

notes

What do you think purpose of valence electrons are?

Valence Electrons and Periodic Basics Sep 14, 2015

Application: Work on Periodic Basic coloring andquestions

Write everything unless it is written in green!!!!

EQ: What information can be gathered from the periodic table?

Agenda

1. Starter2. Valence Electrons Review

Notes 3. Start Periodic Basics

4. Exit 4. Give out Homework Due

9/18

StarterWhat do you think purpose of valence electrons are?

Date Lecture/ Activity/ Lab Page8/28 Syllabus /Notebook Guidelines 1-28/28 Periodic Table/ Formula 3-48/28 Tools/ Measurement 5-68/28 Lab Report/ Investigations 7-88/31 Atomic History 9-10 9/1 Atomic Structure 11-12 9/2 Atomic Charges 13-149/3 Ape Man 15-169/4 Electron Placement 17-189/8 Valence Electrons 19-209/9 Atomic Math 21-229/10 Periodic Table Notes 23-249/11 Atoms test 25-269/16 Periodic Basics 27-28

Table of Contents

The electrons in the outer energy level are called valence electrons

What are valence electrons?

Practice

How do we know how many valence electrons does an element have?

• The group number tells us how many valence electrons are in each element.

Atoms of elements in the same group have the same number of electrons in the outer orbitals/levels of their atoms Exceptions:

Transition elements (3-12) Helium (actually has 2 valence electrons)

Group 1 = 1 electron

Group 2 = 2 electrons

Group 8 = 8 electrons

Except for He, it has 2 electrons

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3, 4, 5, 6, 7

Examples of Group Elements with the same # of valence electrons

87

Fr(223)

55

Cs132.905

37

Rb85.468

19

K39.098

11

Na22.990

3

Li6.941

1

H1.008 +

-

+

-

+++

-

-

-

+++

+++

-

-

-

How many electrons do each of these atoms have in their outer

orbital/level?

What group (family) do these elements belong

to?

Highlight the outer energy level

Name of element

     

# valence electrons

       

Group #

       

HYDROGEN

1

1

Helium

2

18

Lithium

1

1

Nitrogen

5

15

Determine the number of shells and the number of valence electrons for:

Carbon - C

2nd Period = 2 shells

4th Group = 4 valence electrons

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Determine the number of shells and the number of valence electrons for:

Sodium - Na

3rd Period = 3 shells1st Group = 1 valence electron

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{

Write your answers on your handout.

NeName the element. Number of shells ?Valence electrons ?

{

Write your answers on your handout.

Ne

8th Group = 8 valence electrons

2nd Period = 2 shells

NeonName the element. Number of shells ?Valence electrons ?

{

Write your answers on your handout.

H

1st Group = 1 valence electron

1st Period = 1 shell

HydrogenName the element. Number of shells ?Valence electrons ?

{

Write your answers on your handout.

BeName the element. Number of shells ?Valence electrons ?

{

Write your answers on your handout.

Be

2nd Group = 2 valence electrons

2nd Period = 2 shells

BerylliumName the element. Number of shells ?Valence electrons ?

{

Write your answers on your handout.

SName the element. Number of shells ?Valence electrons ?

{

Write your answers on your handout.

S

6th Group = 6 valence electrons

3rd Period = 3 shells

SulfurName the element. Number of shells ?Valence electrons ?

Now Let’s Try Lewis Structures1) Find your element on the periodic

table.2) Determine the number of valence

electrons.3) This is how many electrons you will

draw.

Lewis Structures• Find out which group (column) your element is in.

• This will tell you the number of valence electrons your element has.

• You will only draw the valence electrons.

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Lewis Structures1) Write the element

symbol.2) Carbon is in the 4th

group, so it has 4 valence electrons.

3) Starting at the right, draw 4 electrons, or dots, counter-clockwise around the element symbol.

C

Lewis Structures

C

1) Check your work.

2) Using your periodic table, check that Carbon is in the 4th group.

3) You should have 4 total electrons, or dots, drawn in for Carbon.

Lewis Structures

C

On your worksheet, try these elements on your own:

a) Hb) Pc) Cad) Ar

Lewis Structures

H

On your worksheet, try these elements on your own:

a) Hb) Pc) Cad) Ar

Lewis Structures

P

On your worksheet, try these elements on your own:

a) Hb) Pc) Cad) Ar

Lewis Structures

Ca

On your worksheet, try these elements on your own:

a) Hb) Pc) Cad) Ar

Lewis Structures

Ar

On your worksheet, try these elements on your own:

a) Hb) Pc) Cad) Ar

27 28Valence Electrons and Periodic Basics

Starter

Practice:

Connection:Answer questions using Periodic Basics1. What patterns do you see?2. What do the vertical columns have in common?3. What do the horizontal columns have in common?4. What changes move across the table from left to right?

Exit:

Sep 14, 2015

Glue it in

after the

notes

What do you think purpose of valence electrons are?

Valence Electrons and Periodic Basics Sep 14, 2015

Application: Work on Periodic Basic coloring andquestions

Write everything unless it is written in green!!!!

EQ: What information can be gathered from the periodic table?

{

Periodic Table Basics

1 ________

B2 ________

3 _________

4P = ____ N= ____ E=____

5

Step 1. Complete the card for each element. Complete the top section for each element by adding the element’s 1. atomic number 2. name and 3. atomic mass.

4. Determine the number of protons, neutrons, and electrons in each element.

5. Create a Bohr diagram for each element.

5

Boron

(10.81)=11

5 6 5

Application:

Periodic Table Basics

Step 2. Use color pencils to shade in the card for each element.

not Colored=Hydrogen Green= Li & Na Orange= B & Al Pink= O & S Red= C & Si Blue= Be & Mg Tan= N & P Purple= F & Cl Yellow= He, Ne & Ar

Periodic Table Basics

Step 3. Cut the cards apart and arrange according to atomic number in the pattern shown below on a large sheet of construction paper.

Step 4. After you have arranged the cards in the correct order, glue them to the paper.

1 2

3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18

Connection:Answer questions using Periodic Basics1. What patterns do you see?2. What do the vertical columns have in common?3. What do the horizontal columns have in common?4. What changes move across the table from left to right?

27 28Valence Electrons and Periodic Basics

Starter

Practice:

Connection:Answer questions using Periodic Basics1. What patterns do you see?2. What do the vertical columns have in common?3. What do the horizontal columns have in common?4. What changes move across the table from left to right?

Exit:

Sep 14, 2015

Glue it in

after the

notes

What do you think purpose of valence electrons are?

Valence Electrons and Periodic Basics Sep 14, 2015

Application: Work on Periodic Basic coloring andquestions

Write everything unless it is written in green!!!!

EQ: What information can be gathered from the periodic table?