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Later in the lesson, students will revise their answers.

Tell students: "Atomic mass refers to average atomic mass of the naturally occurring isotopes of any element. Aston separated neon atoms into two different isotopes, after he invented the mass spectrograph.

Ask students: "In this collection of atoms, are all the atoms of a given element exactly the same? Naturally occurring chemical elements are usually mixtures of isotopes, and so their atomic masses are weighted averages of the masses of the isotopes in the mixture.

" Let them explain that isotopes of an element have the same chemical properties but different weights. Distribute the Science Net Links lab packet, Isotopes of Pennies, to each student.

You can assign the Isotopes of Pennies assessment sheet as homework.

Aston, Francis William - 1922 Nobel Biography, on the Nobel e Museum website, provides information about Francis William Aston, the British chemist and physicist who won the 1922 Nobel Prize in Chemistry for discovering isotopes of elements by means of the mass spectrograph.

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The second lesson, Radioactive Decay: a Sweet Simulation of Half-life, introduces the idea of half-life.

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.

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