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Release date: 2008-12-23
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An atom is the smallest part of an element that can exist either alone or in combination with other atoms. Isotopes are atoms that have the same number of protons but different numbers of neutrons.
Release date: 2008-12-23
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Release date: 2008-12-30
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Release date: 2009-01-06
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Release date: 2009-01-13
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Release date: 2009-01-20
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Release date: 2009-01-27