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Some of the information is technical and I have tried to provide references and links for the more difficult portions of the text in order to help any reader go beyond the material presented here.

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The rate of decay (given the symbol λ) is the fraction of the 'parent' atoms that decay in unit time.

For geological purposes, this is taken as one year.

The elements embedded in the Earth's crust decay over time because they are very unstable.

When these elements decay and turn into other elements, scientists measure the difference between the original element and its decayed form.

Radioactive decay is a natural process and comes from the atomic nucleus becoming unstable and releasing bits and pieces.

These are released as radioactive particles (there are many types).

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Tuesday, September 23, 2014 Wednesday, September 24, 2014. Tuesday, September 23, 2014 Wednesday, September 24, 2014 Tuesday, September 23, 2014 Wednesday, September 24, 2014 Absolute Age / Radioactive Dating Determining Absolute Age Essential Questions (leave space to answer): 1.Since the rates at which these elements are fixed, all that's left to do is find out where the element is in its decaying process.The rate by which these unstable elements decay are generally expressed in terms of half-life.We know X’s half life is approximately 3,000 years and that the rock is currently 50% radioactive. Element Z is found in an igneous rock and we are trying to determine the rocks age.We know Z’s half life is approximately 3,000 years and that the rock is currently 25% radioactive. 100% Radioactive Igneous Rock 94% decayed 50% decayed 87.5% decayed 50% Radio- active 75% decayed 25% r-a 12.5% 6% Three Half Lives Four Half Lives One Half Life Two Half Lives Thursday, September 25, 2014 Friday, September 26, 2014 Friday, September 19, 2014 Monday, September 22, 2014 M&M Lab and Article Review M&M Lab and Article Review Essential Questions (leave space to answer): How can two sided objects be used as a model for radioactive decay? Each time you flip a coin, what is the probability of getting heads or tails?Use an element’s Half-life: The time it takes for an element to decay.