Download Atom - Schurz High School

Do Now: (3 min)
Lauren was cooking pasta in the pot. When
it’s done cooking, she needs to separate the
pasta from the water. What separation
technique does she use and why?
In order to get points for your Do Now,
bring it up to the front to get checked
off
Do Now Discussion
Lauren was cooking pasta in the pot.
When it’s done cooking, she needs to
separate the pasta from the water.
What separation technique does she
use and why?
Filtration! She’s removing a solid
from a liquid!
The Atom
10/20/09
Video notes, Stations
The Atom
The smallest particle of an element that
retains all the properties of that element –
the building block of everything!
Today we are learning about:
 The history of the atom
 The experiments used to make models
 The current model and structure of the
atom
Today’s Agenda
1.
2.
3.
4.
Video on the Atom
Stations: Parts of the Atom
Discussion and summary
Reflection
Video: History of the Atom
Very quick (5 minutes)
 Pay attention because the information will
be useful to you in the next activity
 If we find it hard to pay attention – we
can take cornell notes instead

Stations: Parts of the Atom





In your notes, divide a sheet of paper into four
sections (one section for each station0
Work in groups of 2 of your choice
4 minutes at each station to complete the following
tasks:
1. READ ALL of the information at the station
2. Answer the questions at the bottom of each
station (on the back of our notes sheet)
3. Fill in the blanks on our notes sheet that we
missed during the video
NOTE: If the work does not get done, we will lose
the opportunity to choose our partners in the
future.
If you finish early – keep working at the same
station (make your answer better!)
What have we learned? (short
cornell notes)
Atom: The smallest particle of an element that retains
all the properties of that element
Cathode Ray Experiment: discovery of the
electron
Gold Foil Experiment:
◦ Particles pass through foil  atoms are mostly empty
space
◦ Particles bounce off  atoms have a solid center called
the nucleus
Today’s Model:
◦ Proton – in the nucleus, positive charge
◦ Neutron – in the nucleus, neutral (no charge)
◦ Electron –outside of the nucleus, negative charge.
Reflection:
At the bottom of your notes, write about
what you learned today:
What are TWO things you learned today
you didn’t know before?
 What topics do you find confusing?
 What questions do you have?

The Atom
The smallest particle of an element that
retains all the properties of that element
Atoms are too small for us to see, but we
know they are made of three types of
particles: the proton, the neutron, and the
electron.
Scientists use experiments to get clues to
construct models
Atomic Theory (the first model)
John Dalton
 Main points

◦ Atoms are small parts that make up atoms
◦ Atoms of a specific element are different from
those of another element
◦ Atoms cannot be
 created nor destroyed
 divided into smaller parts
Experiment 1: The cathode ray
J. J. Thompson
 Noticed when you placed a magnet near a
cathode ray, it BENDS
 Means the particles in the ray must be
negatively charged!

Plum Pudding Model
J. J. Thompson
 Discovered the electron (negatively
charged particle)
 Because matter is neutral, it must have
both positively and negatively charged
particles
 Proposed a model where electrons are
like chocolate chips

Gold Foil Experiment
Ernest Rutherford
Shot positively charged particles at thin sheet of
gold foil
 Most particles passed through  ATOMS ARE
MOSTLY EMPTYSPACE
 Some particles bounced off  atoms have a
positively charged mass called the NUCLEUS


Today’s Model: Parts of the Atom
The Proton:
◦ Positively charged (1+)
◦ Located in the nucleus
The Neutron:
◦ No charge (0)
◦ Located in the nucleus
The Electron
◦ Negatively charged (1-)
◦ Move around the nucleus in the electron cloud
Reflection
Write your name, date and period on a separate sheet of paper
and answer the following questions:
1.
2.
3.
4.
5.
6.
7.
Define an atom in your own words
What subatomic particle did JJ Thompson discover and what
does it look like in the Plum-Pudding Model?
In the gold foil experiment, most particles passed through
the foil. What does that say about atoms?
In the gold foil experiment, some particles bounced off. What
does that say about atoms?
A proton is ____________ charged and is located
______________.
A neutron is __________ charged and is located
_______________.
An electron is _________ charged and is located
__________________.