September 4-September 8, 2017

3EXPLA~1  Periodic Table

3 Explanation – Counting Elements and Atoms


TeacherCrystal Cornelius
Subject AreaScience
Grade Level8
Week #4
Unit of InstructionAtomic Theory and the Periodic Table
Standard(s) Taught

Explore the scientific theory of atoms (also known as atomic
theory) by recognizing that atoms are the smallest unit of an
element and are composed of sub-atomic particles (electrons
surrounding a nucleus containing protons and neutrons).

Identify the benefits and limitations of the use of scientific

Explain why theories may be modified but are rarely discarded.

Assess how technology is essential to science for such purposes
as access to outer space and other remote locations, sample
collection, measurement, data collection and storage,
computation, and communication of information.

Explore the scientific theory of atoms (also known as atomic
theory) by describing the structure of atoms in terms of protons,
neutrons and electrons, and differentiate among these particles
in terms of their mass, electrical charges and locations within the

Recognize that elements are grouped in the periodic table
according to similarities of their properties.

Explain that scientific knowledge is durable because it is open to
change as new evidence or interpretations are encountered

Relate properties of atoms and their position in the periodic table
to the arrangement of their electrons.

Learning Targets and Learning Criteria

Students will:
• recognize that atoms are the smallest unit of an element
• recognize that atoms are composed of subatomic particles:
o Electrons
o Neutrons
o Protons
• create a model or diagram of an atom (nucleus and subatomic particles)
o discuss the benefits and limitations of various atomic models
• explain that theories may be modified based on new evidence, but are rarely
discarded (in the context of atomic theory)

Students will:
• recognize that elements are grouped in the periodic table according to similar
• predict properties of an element using a periodic table when given information
about other elements in the same column
o NOS Focus- Science is open to change with new evidence

1. Explain that electrons, protons and neutrons are parts of the atom and that the
nuclei of atoms are composed of protons and neutrons, which experience forces
of attraction and repulsion consistent with their charges and masses

1. Use the periodic table and electron configuration to determine an element’s
number of valence electrons and its chemical and physical properties
2. Explain how chemical properties depend almost entirely on the configuration of
the outer electron shell

Classroom Activities

How to draw a Bohr model

Lifesize Periodic Table: Students tile should contain the following:

Chemical Symbol, Element Name, Atomic Number, Atomic Mass, Bohr Model, Number of Valence electrons, Element Classification, Common/major uses, and a 3D Physical representation. Be Creative! 

Assignments Due

Lesson 7 end of chapter review

Additional Resources