Powers and Exponents Worksheet 1. A radioactive element has a half-life of 50 years. That means every 50 years, half the mass of the element is lost and changed to a different form. If there are 80 grams of the element to start, what mass of the element remains after 300 years? a. Complete the chart to show the mass of the element renaming after a period of 300 years. Time (years) Mass Remaining (g) 80 50 40 100 20 150 200 250 300 b. Let m= starting mass and n = number of years, create an expression that predicts the mass of element remaining after n years. mass remaining = c. Use the expression from partb to calculate the mass of the element remaining after 5000 years.

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