chem terms

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5 Terms

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Define: “Average Atomic Mass”   and    “Atomic Mass Unit” (amu).

Average atomic mass is the sum of the weighted average masses of all isotopes. 

Atomic Mass Unit (amu) is the unit of measurement for the mass of atoms.  


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Define:  (a) Nuclear decay

Radioactive nuclei that are highly unstable, emit radiation, and release particles to become stable.

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Half life Period

Half-Life is the time it takes for half of the radioactive atoms  in a substance to decay.

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What are ions?

Ions are atoms that carry positive or negative charges by losing or gaining electrons. 

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How can the 3 particles be stopped?

Alpha → Paper & Skin 

Beta → Layers of clothing & thin layer of substances like Aluminum 

Gamma → Lead, Walls, Concrete, & Steel