| |
|
a |
| |
Day 9:
Atomic Mass and Isotope Calculations then Research Time for the
Atomic Theory Presentation:
-Discuss the
existence of isotopes (should be recognized by students in the prior
assignment, proton/neutron calculations
-Read through Mr. Sklar's "Isotopes" information sheet
-Assign the "Isotopes" assignment
-Library time to wrap-up work on Atomic Theory Presentation |
|
|
a |
Proton/Neutron Calculations
Quiz the students on
what they recall from day 6 and 8. "What parts of an atom do not
significantly contribute to an atom? Which parts to significantly
contribute?" Point out that neutrons and protons are vary similar in
mass. Reinforce the concept of the mass number and enforce the idea that
the number of protons do not change and can be determined by the
identity of the element and vice versa. Point out how several of the
examples from day 8 have the same element with different mass numbers
due to varying numbers of neutrons. Introduce the term "isotope" to the
students.
Hand out the notes on isotopes, average mass, and the
atomic mass numbers found on the periodic table. Work through a few
examples that show how the value of the atomic number can be derived
given the relative percentages of the elements isotopes. Point out that
some isotopes only exist momentarily and do not significantly contribute
to the atomic mass calculations and that the value found must logically
be between the lightest and heaviest isotope.
Hand out the assignment, the students have 10-15min to
get a start on the assignment.
Library/Internet Research
As students near
completion of the assignment, they may be released to the library to
continue researching their Atomic Theory Contributor |
|