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i need to need to no these ? 9.Francium has 36 isotopes, but only francium-223 occurs in nature. Francium-223 spontaneously emits particles and energy, so francium-223 is a(an) of francium 11 A flight simulator that helps astronauts prepare for a shuttle launch is an example of a(an) flight test . 19.How do you know that magnesium is the more metallic element in the compound magnesium oxide, MgO?

Physics
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i go to your school :)

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