Name: _____________________________________________ Class Period: ________ Due Date: ________
Atomic Theory and Structure
Objective: Students will research the history of the atom in order learn how the structure of atoms came to
be understood.
Science TEKS: 8.5A – Describe the structure of atoms, including masses, electrical charges and locations of
protons and neutrons and electrons.
ATL Skill: Communication - Organize and depict information logically
Directions: Use the resources listed here and posted on Unit 2 of the teacher website, to complete each task.
Task 1: Atomic History
Resource: Science Fusion Textbook pgs. 116-117 and video: “This is not what an atom looks like”.
(Posted on teacher website)
Directions: To organize the influential scientists and their contributions, fill in the information:
John
John Dalton
Dalton –– year:
year:
Draw his atom here:
Dalton’s
Dalton’s Theory
Theory was
was called
called what?
what?
Explain
Explain theory
theory --
JJ Thompson – year:
Draw his atom here:
What was his experiment about?
JJ Thompson thought -
Earnest Rutherford – year:
Draw his atom here:
What was his experiment about?
What is a proton?
Neils Bohr – year:
Bohr thought what was in the center of the atom?
Where does he put electrons?
Bohr’s model helped with what?
Draw his atom here:
Summarize the current atomic theory: __________________________________________________
__________________________________________________________________________________
__________________________________________________________________________________
Task 2: The structure of the Atom
Resource: http://www.chem4kids.com/files/atom_structure.html
Directions: Fill in the information for the basic atomic structure.
A: _______________________
B: _______________________
C: _______________________
Write 2 facts about electrons:
Write 2 facts about protons:
Write two facts about neutrons:
Task 3: Bohr Atomic Model
Resources: Bohr model reading and link (both are posted on teacher website)
Directions: Answer these questions about the Bohr model.
Bohr Model Questions
1. How does the Bohr model show that the electrons in atoms are in orbits of differing energy?
2. Explain what these circles are representing on the model:
3. How does an electron move from its grounded state to the excited state?
4. Bohr numbered the electron’s energy levels. What does the higher the energy-level number
mean?
5. Draw a simple example of the Bohr model here:
Task 4: Current Atomic Model
Resources: Website link (posted on teacher website)
Directions: Answer the questions about the Cloud model of the atom.
1. In this atomic model, what does the “cloud” represent?
2. Draw the electron cloud model of the atom here: