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In this activity, learners build models of atoms and molecules, then consider their role in different phases of matter, density, and mixtures and solutions.

$1 - $5 per student Ages 8 - 14 30 to 45 minutes
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This paper describes a working-model demonstration of Ernest Rutherford's 1911 experiment about the nature of atoms.

$10 - $20 per group Ages 11 - adult 45 to 60 minutes