Lesson Plan Day: 32 10/7
Teacher: P. Kirk
Topic: Structure of the atom. Types, location, charge and number of
C.PM: STRUCTURE AND PROPERTIES OF MATTER
C.PM.1: Atomic structure - Evolution of atomic models/theory
Define an atom. Learn the evolution of atomic models. Discuss the
types, charges and location of particles within the atom. Gain an
understanding of how experimentation has led to an understanding of the size,
shape, charge, parts and structure of the atom.
Students will mimic the Rutherford particle experiments that allowed us to
determine the presence of a positive, dense nucleus and the size an atom.
Nucleus, proton, electron, neutron, alpha particle, source, scintillations
Students will roll marbles on the floor at shapes (2 boards for Shapes
Activity I and 1 board for Shapes Activity II) that are hidden beneath boards
in order to determine their shape (Hypothesis) without looking. This process
will mimic Rutherford's experiment where he directed a stream of alpha
particles at a thin sheet of gold foil in order to discover that a relatively
large positive nucleus existed in atoms that deflected the path of the
positive alpha particles. He was quoted as saying that the particles that were
deflected back at the source were as amazing as bullets bouncing off of a
sheet of tissue paper. Students will answer questions about the activity
and turn in for a grade.
The teacher will lay out the boards on the floor with the larger shapes for
Activity I and smaller shapes with smaller marbles for Activity II. Students
will rotate between 2 boards 8minutes each. Lift the boards after students did
Activity I show (Actual) and replace the shape with smaller shape while
students trade out large marbles for smaller marbles. Should take about
10minutes for Activity II. Reveal the shapes to show (Actual). Teacher will
grade the lab for 10 to 15 points for general idea that we can determine the
shape of something that we can't see with out eyes if we design a good
Shapes for Activity I with large marbles, Shapes for Activity II with small
marbles. The boards that sit atop the shapes. Copies of the lab activity.
Teacher should monitor student progress through the experiment making sure
they do not cheat and look under the boards. Can collect individual or group
papers for grading the 10 to 15 point lab activity.