Isotopes used for carbon dating
To demonstrate that isotopes of an element have different masses; that isotopes are atoms of the same element that have different numbers of neutrons; and that atomic mass is the weighted average of the naturally occurring isotopes of an element.
Before working on this lesson, students should be familiar with the periodic table and should have had some basic instruction in the following concepts: isotopes, mass number, and atomic number.Since it is an average of various isotopes, it is generally a decimal number. Since that time, many isotopes of the elements have been discovered.Mass number, on the other hand, is the count of protons and neutrons for any single isotope and is always an integer." Display a "collection of atoms" such as a beaker of a solution or a glass of milk. They are all listed in many places, including the websites used in this lesson." Remind students that ALL atoms are isotopes.Students should be able to complete parts A, B, and C in one class period.You can assign the Isotopes of Pennies assessment sheet as homework.