UNIT 7 NUCLEAR REACTIONS 7.3 Calculating Half Life? May 17, 2011 DO NOW: 4.5-3.4 = 1.1 3.4/4.5 = If we start with 4.5 grams of Radon-222 and over a period.

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UNIT 7 NUCLEAR REACTIONS 7.3 Calculating Half Life? May 17, 2011 DO NOW: = /4.5 = If we start with 4.5 grams of Radon-222 and over a period of time we have 3.4 grams left over, what is the fraction remaining of this sample? AIM: How do we calculate a half-life of radioactive material?

WHAT IS A HALF LIFE? The amount of time it takes for the mass of a radioactive sample to decay by half. Half-life is AMOUNT OF TIME Table N

INDEPENDENT PRACTICE Complete the worksheet HOMEWORK: READ THE ARTICLE AND WRITE A SUMMARY (answer all the questions listed)