Name____________________
Date__________________
Science
Unit 3 Periodic Table
Lesson 1 The Atom
Page 158
What makes up matter?

Democritis believed that you would eventually end up with a particle that
_____________________ be cut.

He called this _________________ the Greek meaning
“________________________________________”.
Page 159
Atoms

The _________________ particle into which an element can be diveded and be
the same element.

Is consided the _____________ unit of matter.

You _______________ see individula atoms, but they make up everything you
see.

Many types of atoms that ___________________ in different ways to make
___________ substances.

Atoms are so ___________________ you can’t see them with an ordinary
microscope.
Name____________________
Date__________________
Science
Unit 3 Periodic Table
Pg. 160
Atomic Theory
John Dalton 1808

Dalton’s theory stated that all ________________ is made of
_______________.

He believed that atoms cannot be created, ______________,
or_____________________.

All atoms of certain elements are __________________, but they
are ______________________ from atoms of all other atoms.

Every substance is made up of atoms ______________________ in
certain ways.
Pg. 161
J.J. Thomson 1897

Atoms are made up of even ________________ particles.

Paricles within the atom have _____________________ charge.

The negatively charged particles are called__________________.

Atom was __________________ sphere with ______________ mixed
through it.
Name____________________
Date__________________
Science
Unit 3 Periodic Table
Ernest Rutherford 1909

Atoms have a _______________-a small, dense _____________ that has a
_________________ charge and is surrounded by moving
__________________.

Later he found the nucleus had __________________ charged particles in
the nucleus called __________________.
Niels Bohr 1913

Electrons move around a nucleus in a ______________________ paths.

Each path is a __________________ distance from the
__________________.

His model helped scientist predict the ____________________
_________________________ of elements.
What is the Current Theory?
 Atoms are ________________ unit of matter.
 Atoms of each element are ______________.
 Atoms are made up of _________________ and protrons.
 1932, Chadwick discovered that the nucleus contains uncharged
particles called __________________.
 Electrons move within an area around the nucleus called the
_____________________ __________________.
Name____________________
Date__________________
Science
Unit 3 Periodic Table
Pg. 162
What are the parts of an atom?
Protrons

Are ________________ charged particles of the atom.

The charge is written as __________.

The mass of a protron is very _________________.

The measure unit for them is the _________________
_________________ mass _______ (u).

The mass of a protron is ___________(u)

Particles that have ________ electric _____________.

Is a little more _____________ than protrons are.

Atoms usually have at least as many ________________ as they
Neutrons
do protrons.

Together protrons and neutrons for the ______________ in the
center of the atom.
Pg. 163
Electron Cloud

The __________________ charged atom is called electrons.

It is not possible to determine both their exact
_________________________ and ________________ at the same time.
Name____________________
Date__________________
Science
Unit 3 Periodic Table

Electrons are located in an ______________________
_________________________.

Compared to protrons and neutrons, electrons have very
little ______________.

It is so small that it is usually thought almost ____________.

The charge of a single elctron is represented __________.

The number of protrons in an atom is ____________ to the
number of protrons.

The atom has an overall charge of ________.
Pg. 164
How can we describe atoms?
By Atomic Number

The number of ___________________ is the atomic _______________.
Pg. 165
By Mass of the Number

Atoms of certain element always have the same number of
protrons, but not always the same number of ________________.

____________________ are atoms of the same element that have
different number of neutrons.

The total number of _________________ and ______________________
in an atom is its mass number.