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" Accept all answers and ask students to record their answers to this question in their science journals.Later in the lesson, students will revise their answers.The final lesson, Frosty the Snowman Meets His Demise: An Analogy to Carbon Dating, is based on gathering evidence in the present and extrapolating it to the past.This lesson helps students build their understanding of the properties of matter, specifically it will help them understand that average atomic mass is not a simple average, but is weighted according to percent abundance.The most important features of isotopes (with respect to general scientific literacy) are their nearly identical chemical behavior and their different nuclear stabilities.

A block of pure carbon, for instance, is made up of two kinds, or isotopes, of carbon atoms that differ somewhat in mass but have almost identical chemical properties.

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.

Students should be able to describe an atom and its basic structure.

Have students refer back to their answers to the question in the motivation.

(Why do all the atomic masses on the periodic table include decimal points instead of just whole numbers?

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