Lokda
Name ___________________________
Chapter 4
Class ___________________
Date _____________
Atomic Structure
Section 4.1 Studying Atoms
(pages 100-105)
This section discusses the development of atomic models.
Reading Strategy (page 100)
Summarizing As you read, complete the table about atomic models.
For more information on this Reading Strategy, see the Reading and
Study Skills in the Skills and Reference Handbook at the end of your textbook.
Atomic Models
Scientist
Evidence
Model
Dalton
Ratio of masses in compounds
Indivisible, solid spheres
Thomson
Deflected beam
Negative charges evenly scattered through positively charged mass of matter
(plum pudding model)
Rutherford
Deflection of alpha particles passing through gold foil
Positive, dense nucleus
© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
Ancient Greek Models of Atoms (page 100) atoms 1. Democritus named the smallest particles of matter because they could not be divided.
2. List the four elements that Aristotle included in his model of matter.
Earth
Air
a.
b.
Fire
Water
c.
d.
Dalton’s Atomic Theory
(page 101)
3. Is the following sentence true or false? John Dalton gathered evidence for the existence of atoms by measuring the masses of true elements that reacted to form compounds.
4. What theory did Dalton propose to explain why the elements in a compound always join in the same way? He proposed that all matter is made up of individual particles called atoms, which cannot be divided.
5. Circle the letters of the sentences that represent the main points of
Dalton’s theory of atoms.
a. All elements are composed of atoms.
b. In a particular compound, atoms of different elements always combine the same way.
c. All atoms have the same mass.
d. Compounds contain atoms of more than one element.
Physical Science Reading and Study Workbook
I
Chapter 4
35
Name
Chapter 4
Class ___________________
Date _____________
Atomic Structure
Section 4.1 Studying Atoms
(pages 100-105)
This section discusses the development of atomic models.
Reading Strategy (page 100)
Summarizing As you read, complete the table about atomic models.
For more information on this Reading Strategy, see the Reading and
Study Skills in the Skills and Reference Handbook at the end of your textbook.
Atomic Models
Scientist
Evidence
Model
Dalton
Ratio of masses in compounds
Indivisible, solid spheres
Thomson
Deflected beam
Negative charges evenly scattered through positively charged mass of matter
(plum pudding model)
Rutherford
Deflection of alpha particles passing through gold foil
Positive, dense nucleus
© Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved.
Ancient Greek Models of Atoms (page 100) atoms 1. Democritus named the smallest particles of matter because they could not be divided.
2. List the four elements that Aristotle included in his model of matter.
Earth
Air
a.
b.
Fire
Water
c.
d.
Dalton’s Atomic Theory
(page 101)
3. Is the following sentence true or false? John Dalton gathered evidence for the existence of atoms by measuring the masses of true elements that reacted to form compounds.
4. What theory did Dalton propose to explain why the elements in a compound always join in the same way? He proposed that all matter is made up of individual particles called atoms, which cannot be divided.
5. Circle the letters of the sentences that represent the main points of
Dalton’s theory of atoms.
a. All elements are composed of atoms.
b. In a particular compound, atoms of different elements always combine the same way.
c. All atoms have the same mass.
d. Compounds contain atoms of more than one element.
Physical Science Reading and Study Workbook
I
Chapter 4
35
Name