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Welcome to Chemistry

Agenda

Transmutation/Radioactive Decay Products

Announcements

 (^) Homework: Homework questions due 01/06/  (^) Afterschool Sessions this week  (^) Thursday with Mr. Weitzman in 242  (^) Unofficially with me in 242 Friday?  (^) Test #4 next Tuesday

Natural Decay: Alpha

Speed Mass Charge

slow 4 amu + parent nucleus emission daughter nucleus

Natural Decay: Beta

Speed Mass Charge

ß-

medium 0 - 1 1 0 n p + e 0 1 - parent nucleus emission daughter nucleus

Natural Decay: Gamma ► (^) Usually follows all nuclear changes... Usually not written ► (^) Electromagnetic radiation

Speed Mass Charge

FAST 0 0

Rank the emissions in order of increasing penetrating power Penetrating Power

Table N: Half-Life of Radioisotopes

Using Table N

 (^) Table N shows natural decay processes of several radioisotopes  (^) Radioactive decay is the process by which an unstable atom loses energy via radiation.  (^) Natural decay—naturally occurring, not human-induced.  (^) We can use this information to help us figure out what products are going to arise from natural decay.  (^) Some important information about natural decay  (^) There is always going to be one reactant (starting material)—the original radioisotope  (^) There will always be two products—the emitted particle and the new isotope  (^) Mass and charge MUST balance out.

Take your time and think it out…

• Write symbol of radioisotope in proper notation on reactant side
• Write notation for radiation type as product
• Total up mass #'s on top so total mass is balanced on each side
• Total up the atomic #'s on bottom so they're balanced too
• Use Periodic Table to identify the daughter element by its atomic #

Let’s try this together

 (^) Determine the product that forms from the radioactive decay of uranium-238.