History of the Atom
Opener
 Copy question and answers
 What are the building blocks of all matter
 A. Mass
 B. Molecules
 C. Atoms
 D. Pure Substances
Review
 Test
 Binder Check
 Turned in Openers
Test
 Take a look
 Make sure that I graded it correctly
 I think there may have been a mistake or two on the key
 15 minutes to correct problems
Standards List
 New Standards List
 New Unit
 Two weeks
 Broken up with Fall Break
 It will be important for you to study
 Last unit of the term
Pre-Test
 25 minutes
 Answer all questions
 Do your best
Opener
 Copy question and answers
 What subatomic particles have the same mass?
 A. Proton and electron
 B. Proton and neutron
 C. Electron and neutron
 D. All three have the same mass but different charge
Review
 Test corrections
 Pre-Test
 Looking forward…
 ACT practice test tomorrow
 Baseline data for student growth
Notes
 Notes on the Atom
 You may know most, if not, all of this stuff
First off, what is an atom?
 Atoms
are the smallest parts to
which an element can be divided
yet still be that element.
 Atoms are the building blocks of all
matter.
How small is an atom?

An atom is so small that a penny
contains about 2 x 1022 or
20,000,000,000,000,000,000,000
atoms!!!
But there’s more…

Atoms consist of even smaller particles.
These include:
– Protons
– Neutrons
– Electrons
Parts of an Atom
The protons and
neutrons make up
the center or
nucleus.
The Nucleus
 The
center of an atom
 Small, dense (packed tightly)
 Contains protons and neutrons:
most of the atom’s mass
 So dense, if it were the size of a
grape, it would weigh over 9 million
tons!
Protons
Located in the
nucleus
 Positive charge (+)
 Mass of 1 atomic
mass unit (amu)

protons = positive
Neutrons
 Located
in the
nucleus
 Have no charge
- neutral
 Mass of 1 amu
neutrons = neutral
Electrons
Found outside of the nucleus in electron
clouds
– (think of rings around a target)
 Negatively charged (-)
 Mass of almost zero
 Number of electrons equals the numbers
of protons to cancel out the charges
– (think of -1+1=0)
electrons = negative

Review: Parts of an Atom
Parts
Charge
Location
Mass
Proton
Positive (+)
Nucleus
1 amu
Neutron
No charge
Nucleus
1 amu
Electron
Negative (-)
Electron
Clouds
Almost zero
Practice Problems

Protons = Electrons

Protons + Neutrons = Mass number
–
–
Mass number – Protons = Neutrons
Mass number – Neutrons = Protons
Your turn

Work on this now

What you don’t finish will be homework
Opener

Copy question and answers

What is the charge on the nucleus of the
atom?
–
–
–
–
A. Positive
B. Negative
C. Neutral
D. It depends on the type of atom
Review

Notes on the Atom
–
–

Parts?
Charges?
Worksheet
–
–
Any questions?
Turn in
Practice ACT

Do your best
–

35 minutes
–

Benchmark is 23
Don’t begin until I tell you
This is for baseline data but I am giving you
an effort grade today
Opener

Copy question and answers

How many protons, neutrons and electrons
are in Calcium-40?
–
–
–
–
A. 20, 21, 20
B. 20, 19, 20
C. 40, 40, 40
D. 20, 20, 20
Review

Practice ACT
–
–
We still need to score
Goal Setting Sheet
Results

Let’s grade them
–
–
Need to get your score
Answer questions on Goal Setting Sheet

Make sure to graph your results

I will assign you a number code that will
represent you

Scores will be placed on a data wall
Timeline Project

Research scientists that contributed to the
atom

Today is the only day we have laptops

We will take time in class today and
tomorrow to make the timeline
Opener

Copy question and answer
–

This one isn’t multiple choice
Which element has 12 protons, 12 electrons
and 13 neutrons? (Give symbol, name and
mass number)
Review

Timeline project
–
–

Any questions?
Any issues?
Make sure you have a happy and safe break
Timeline Project

Turn in before you leave
–

Computers are available
–

If not, it will be a zero
I have paper, colored pencils, markers, crayons
If you have questions, let me know
Surprise!!! Don’t Tell Anyone!!
Happy Fall Break

Finish your timeline over break
–
–
Don’t forget
100 points on Monday


Not “Can I finish on Monday”
It has to be done when you walk in
Opener

Copy the question and answers

Which scientist is known as the Father of the
Atom?
–
–
–
–
A. Democritus
B. John Dalton
C. J.J. Thomson
D. Ernest Rutherford
Review

Hope you had a wonderful break

Turn in your timelines
Notes

I am going to quickly go over these

Take notes on what you want/need
Opener

Copy the question and answers
Review

Notes on Atomic Theory
–
I hope you paid attention
Worksheet

12 minutes to complete
–
–
You may work together
All stuff I covered yesterday
Missing Pieces

Did not talk about Bohr

Need to finish those notes
Bohr Models

Guided Practice

Answers to Guided Practice PowerPoint
need to go in your notebook
Assignment

Choose 20 atoms and draw the Bohr Models
–

DO NOT use ones we have already drawn in
class
Due tomorrow