Lesson 5 - Elements' Reactivity

• Science
• 9th Grade

Reactivity of Elements

             Learning Intention: 

What? We are learning to predict the reactivity of elements on the 

periodic table. 

Why?  In order to know what makes atoms stable. 

             Success Criteria

I can: 

- Explain when an atom has met the Octet Rule

-use the Periodic Table to predict the reactivity of an element. 

- Define electronegativity

- Name the groups on the PT, rank their electronegativity, and reactivity.

Video Lab:

 How can we predict the  

 reactivity of elements?

1. Sodium (Na) reacts with water. Absent Click HERE and HERE for examples.

2 - 3.   Rubidium and Cesium reacts in water- Absent Click HERE for examples.  

      Rank the three elements from MOST (3) reactive to LEAST (1) reactive. 

4.   Calcium (Ca) reacts with water. Absent Click HERE watch from 5:30 - 6:50

      

            Is Calcium more OR less reactive than the elements in Group 1?

5.  Iron (Fe) and Zinc (Zn) reacts with water.  Click HERE for Zinc. Stop at 30sec. 

      

            Do these elements react more OR less than Calcium?

6.  Antimony reacts.  Click HERE.   

      

            Does Antimony react more OR less than  Iron and Zinc? 

7. Fluorine reacts.  Click HERE                                              

8. Chlorine reacts.  Click HERE                      Halogens-Chemistry in Context

9. Bromine reacts.  Click HERE 

10. Iodine reacts:  Click HERE

When comparing, think SPEED!

On the PT, rank the three elements from MOST (4) reactive to LEAST (1) reactive. 

Claim:                                                  

Evidence:                                                                                                               

Reasoning:                                         

Don't forget to use your Sentence Starters and Rubric.

1. Use the evidence from the Video Lab to complete the CER on the back of your Lab page. 
2. Turn in your Lab Sheet to the correct Block Basket. 

Try to determine what is meant by these 2 puns. 

Atoms are the happiest when they have a FULL outer shell. 

- This means they are stable. 

- This means they have 8 valence electrons. 

NOTES:

Look for FULL Outer shells

 FULL Outer shells:  Group 18- STABLE!!

How can Groups 1 - 17 become stable?

Glue this copy of the PT in your Spiral.

ADD this to your NOTES:

Electronegativity is a chemical property that describes the power of an atom in a molecule to attract shared-pair electrons towards itself.

Reactivity Increases

Reactivity Increases

Reactivity Increases

Reactivity Increases

Non-reactive

Electronegativity  Increases

Read It / Organize It: 

1. Click HERE for the Reading.

2. As you read, draw the following arrows in the correct place on the Bohr Model PT in your Spiral.

3.Note definitions for the 3 underlined bold words in the reading. 

4. Label the names of the groups on your PT. 
 

Electronegativity Increases

Watch the video on the next slide. 

There will be questions as you watch. 

Determine if you need to change any of the arrows on your PT. 

How well did you do? Check your work. Make corrections. 

00:20

Chemical reactivity can be seen in the form of

1. bubbles and change of colors
2. explosion, bubbles, color change, or precipitate (forms a solid)
3. Forms a precipitate (solid)
4. explosion and light

00:55

Elements are nonreactive if they have

1. more electrons than protons
2. same number of protons and electrons
3. a positive charge
4. a full outer shell

01:03

Elements in Group 18 are known as the

1. Noble Gases
2. Transition Metals
3. Halogens
4. Alkali Metals

01:53

Group 1 is known as the ____ Metals and are the _____ reactive metals because they have ___ valence electron.

1. Alkali - most - two
2. Alkali - least - one
3. Alkali - most - one
4. Transition - most - one

02:02

Reactivity _____ as we move down Group 1 .

1. stays the same
2. decreases
3. increases
4. reaches equilibrium

03:07

The more energy levels an element has, the _____ reactive it will be.

1. less
2. more

03:17

Which Group of Metals are more reactive?

1. Group 1
2. Group 2