Do Now

1. What is an atom?2. What is an element?3. What is a molecule?4. What is a compound?

Answer in complete sentences!Can’t remember? Use your notes or

your textbook.

Homework and Announcements Textbook Pages: 318-321 All questions and

activities

Chapter 9 lesson 1 Vocabulary Chart (pg. 313)

USA TestPrep

Science Fair Projects – Due Friday Complete (Pre-lab forms and Research Summary)

L.O.: SWBAT describe the structure of an atom.

Title: Structure of an atom

Compounds Most elements in nature are found

combined to other elements. A compound is a pure substance made of

two or more different elements chemically combined in a set ratio.

A compound may be represented by a chemical formula, which shows the elements in the compound and the ratio of atoms. For example: H₂O The ratio of hydrogen

atoms to oxygen atoms is 2 to 1.

Compound Review – Remember the Shells? When elements are chemically combined, they form

compounds having properties that are different from those of the uncombined elements.

Example

Calcium (solid) + Carbon (solid) + Oxygen (gas)

= Calcium Carbonate

What is an atom?

Matter “stuff”Made up of

compoundsMade up of

elementsMade up of atoms

Atom Basic particle of

which all elements are made.

How big is a cell anyway?

http://learn.genetics.utah.edu/content/begin/cells/scale

7

http://scaleofuniverse.com

All atoms have the same basic structure with the same three components.

3 components of an ATOM

1. Protons

2. Neutrons

3. Electrons

p

n

What three particles make up an atom?

Share with the members of your group.

Where is each particle found? Atom

1. Protons– Found in the center (or nucleus) of the

atom.

2. Neutrons– Found in the center (or nucleus) of the

atom.

3. Electrons– Found constantly moving around the

nucleus.

p

n

What does an atom look like?

NUCLEUS

(Protons and Neutrons)

CLOUD OF ELECTRONS

(electrons)

+

+ ++ +

PARTICLE SYMBOL CHARGE MASS

PROTON

NEUTRON

ELECTRON

Draw and label the chart as shown below.What are the three particles that make up an atom?

PARTICLE SYMBOL CHARGE MASS

PROTON

NEUTRON

ELECTRON e-

n

p+

Each component is has a symbol.

Each component can be categorized by their charge.

PARTICLE SYMBOL CHARGE MASS

PROTON

NEUTRON

ELECTRON -1

0

+1

e-

n

p+

PARTICLE SYMBOL CHARGE MASS (amu)

PROTON

NEUTRON

ELECTRON -1

0

+1

~ 0(Nearly 0)

1

1

e-

n

p+

Each particle has a specific mass.

Pair-ShareProton, Neutron, or Electron It is the particle of an atom

represented by the symbol (n).

Neutron

It is the particle of an atom with no charge.

Neutron

Pair-ShareProton, Neutron, or Electron

It is the particle of an atom with a mass of zero.

Electron

This particle has a charge of +1.

Proton

Pair-ShareProton, Neutron, or Electron

Name the two particles with a mass of 1(amu).Proton and Neutron

It is the particle that is represented by the symbol e-. Electron

Pair-ShareProton, Neutron, or Electron It is the particle of an atom with a

negative charge.Electron

The two particles located in the nucleus of an atom.Protons and Neutrons

In your notes, draw a model of the following...

Draw a model of an atom.Label the following:

Protons Neutrons Electrons Nucleus

e e

e

e

p

p

p

n

n

n

np

Summary

Write a paragraph (3-4 sentences) reflecting on today’s lesson. What is an atom? What makes up an atom? What symbols are used to describe an atoms

components?

Chapter 9 lesson 1 Vocab.

Are you on task?

Textbook pages 318-321 Answer all question/activitiesVocabulary Chapter 9 lesson 1 (Page 313)

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