Bohr Model vs. Wave Model + Lewis Dot Diagrams - Day 2

You Will Need:1. Pencil, Text Book- Periodic Table,

Colored Pencils2. Get out Bohr Model vs. Wave Model &

Lewis Dot 3. Textbook open to Periodic Table (196-

197)3. Electrons & Chemical Bonding 2 pages-

4 sides (Pick-up from bookshelf- Please Staple to the back of yesterdays papers)

YOU SHOULD NOW HAVE 4 pages 7 sides to your packet.

Please SCHEDULE:

1. To take Part 2 for the 1st time OR to

2. Retake Test #3

• Part 2 – 101/145 or lower

3. Parent Signature and Corrections – due Tomorrow.

1. What is one similarity between the Bohr Model and Wave Model?

2. Why do scientists use models to study the atom?

3. Which scientist believed the atomic structure to be like Plum Pudding?

4. What is an electron configuration?

5. Where do you find the valence electrons?

6. What is the valence of Silicon? How do you know?

7. How many more bonds does Silicon need to be full?

8. What are the names of the two main types of bonds?

9. Which type of bond are made when oppositely charged atoms are attracted to each other?

10.If I find an element on Row 2, how many shells will the atomic structure have?

11.What is the valence of Helium?12. What does the Lewis Dot

Diagram show??

Question Answer

How do you determine the electron configuration of the atom? (This works for only the 1st 3 rows)

• Rows the element is on = # of shells around nucleus

• To load electrons on each shell – count the number of elements in each row….this is the maximum number of electrons that can fit on that shell

• YOU MUST load the inner shell FULL before moving on to the next shell.

If the element is found in:

Row #1 = 1 shell Maximum # of electrons = 2

Row #2 = 2 shells Maximum # of electrons = 8


YOU MUST ALWAYS fill the inner most shell FULL before moving on to the next shell.

Row # = # of shells in diagram

# of elements in each row = Max electrons on that shell

Question Answer

How do you determine the electron configuration of the atom? (This works for only the 1st 3 rows)

• Rows the element is on = # of shells around nucleus

• To load electrons on each shell – count the number of elements in each row….this is the maximum number of electrons that can fit on that shell

• YOU MUST load the inner shell FULL before moving on to the next shell.

If the element is found in:

Row #1 = 1 shell Maximum # of electrons = 2



YOU MUST ALWAYS fill the inner most shell FULL before moving on to the next shell.

Question Answer

What about elements on rows 4,5,6 and 7?(Do not need to know this for 8th grade)

• These Bohr models include subshells, s, p,d & f

• http://www.chem4kids.com/files/elements/006_shells.html

• http://education.jlab.org/qa/electron_config.html

What is the Lewis Dot Diagram?http://www.youtube.com/watch?v=ulyopnxjAZ8&feature=relmfu

• Shows how an element will bond• Use the element symbol + the number

of valence electrons

Example: Beryllium = Family 2 = Valence of 2

BePlease correct your worksheet.

Let’s try a couple: Follow these directions to complete the next page

1. Locate the element on the P.T.2. Record the information about the element in column 1 of the

chart3. Draw the nucleus and write the # of each type of subatomic

particle4. Draw the correct amount of shells outside the nucleus based

on the row the element is found5. Start loading electrons on the specific shells from the inside out

(closest to the nucleus)6. Load each level (shell) FULL before going to the next.

(Remember: each shell has a “maximum FULL” amount.)

Element Bohr Model Lewis Dot (Symbol + Valence)

Lithium

Atomic #

Atomic Mass – Atomic #

Row =

Electrons= Protons =

Neutrons =

Before moving to the next slide…..try to do this on your own and then check your answer

Element Bohr Model Lewis Dot (Symbol + Valence)

Lithium

Atomic #


Neon

Atomic #


Row =


Neutrons =

2

3-3+

7-3=

4

P = 3N = 4

21

Li

Row =


Neutrons =

P =10N =10 Ne

10

10-10+

20-10

10

28

Oral Presenters: In charge of today’s lesson on the computer

Everything on this planet is made of atoms from elements.

Even though the number of letters on the Periodic Table is limited, joining the letters in different ways allows you to make a huge number of combinations.

Question Answer

What is chemical bonding? • The joining of two or more atoms to form a compound

Do the compounds have the same characteristics as the elements that make them up?

• NO• Compounds have very different

characteristics

What happens when elements bond?http://www.mhhe.com/physsci/chemistry/animations/chang_7e_esp/bom1s2_11.swf (View the animation on LearningPoint)

• They can share valence electrons (COVALENT)

• They can transfer valence electrons (donate or accept electrons becoming ions)

(IONIC)

Do all the electrons in the atom make a chemical bond?

• NO• Only the valence electrons are

involved in most cases

When will atoms bond? • When their outermost shell is not complete

Element Group Valence Bond or Not Bond

Hydrogen 1 1 Bond

Magnesium

Oxygen

Sulfur

Krypton

Lithium

Carbon

Question Answer

What are the characteristics of Ionic Bonds?

• Usually between Metals and Nonmetals• Transfer of electrons – atoms become

IONS• Form Crystal Lattices• Brittle• High melting and boiling points• Dissolve easigly in water• Form compounds• Specific shape

Bismut

h

Crystal Lattice

Question Answer



IONS• Form Crystal Lattices• Brittle• High melting and boiling points• Dissolve easily in water• Form compounds• Specific shape

Illustrate a neutrally charged Bohr Model of an aluminum atom.

Before you move to the next slide….try to draw this on your own and then check to see how you did.

If you made a mistake….figure out what you did incorrectly.

Question Answer



IONS• Form Crystal Lattices• Brittle• High melting and boiling points• Dissolve easily in water• Form compounds• Specific shape

Illustrate a neutrally charged Bohr Model of an aluminum atom.

P=13N=14

2 83

Question Answer

Illustrate a positively charged Bohr Model of an aluminum atom. (3+)

Before you move onto the next slide….try to draw this on your own.

Question Answer

Illustrate a positively charged Bohr Model of an aluminum atom. (3+)

Why is Al3+ considered an ion? (Look at all the subatomic particles before you answer this question.)

P=13N=14

28

Forming Sodium Chloridehttp://www.youtube.com/watch?v=upg-FUHp6yshttp://www.youtube.com/watch?v=7DjsD7Hcd9U

Before (pg. 233) After

Questions:1)Why does Sodium become an Ion? 2)Is it Positive or Negative? Why?3)Why does Chlorine become an Ion? 4)Is it Positive or Negative? Why?

Questions:1)Why do Sodium and Chlorine bond?2)What is the overall charge of the compound?3)Does NaCl have the same characteristics as Na and Cl?4)What are some unique characteristics of NaCl?

Question Answer

What is a covalent bond? • Valance electrons are shared• More often between nonmetal• Low melting and boiling point• Free flowing but can be brittle• Form molecules• Do not have a specific shape - flexible

C6H10O5

C12H22O11

Molecule Illustration

Explanation Electron Dot (Color Code each element)

1. What kind of bond does Hydrogen & Oxygen make? How do you know?

2. Why does one Oxygen bond with two Hydrogen atoms?

http://www.youtube.com/watch?v=ulyopnxjAZ8&feature=relmfu Drawing Lewis Dot Diagram Bonds

P=8N=8

P=1N=0

P=1N=0

1. Schedule Test #3 retake

2. Signed & Corrected Test #3- Due Tomorrow

3. Bohr Model vs. Wave Model & Lewis Dot + Electrons and

Chemical Bonding– Pgs. 1-7 – due Thursday

Education

Bohr Model vs. Wave Model + Lewis Dot Diagrams - Day 2