Radioactive+Dating

__ Radioactive Dating __ Copy and complete the numbered items. 25% if you just complete. 50% if you just copy. 100 if copied and completed with the correct answers. The question before the numbered item will help you complete the numbered item after it.

What kind of atoms give off particles and energy? 1. …… elements give off particles and energy. An atom of one element can break down by giving off radiation to form an atom of another element. What is this process called? 2. During …… atoms of one element breaks down to form atoms of another element. In what type of rock to radioactive elements initially occur? 3. Radioactive elements occur naturally in …… rock. What property of radioactive elements allows them to be used to date rocks? 4. Scientist try to use …… to calculate the absolute age of rocks. What happens to the amount of radioactive elements in a rock over time? 5. Over time the amount of radioactive elements in a rock …. What happens to the amount of the new "daughter" element in a rock, as the radioactive "parent" element decays? 6. Over time the amount of new "daughter" atoms in a rock... What technique is used to find the absolute age of a rock? 7. The absolute age of a rock may be determined by a technique called... What must be known about the radioactive element in radioactive dating? 8. The first step in radioactive dating is … What must be known about the stable "daughter" element in radioactive dating? 9. The second step in radioactive dating is… What ratio is used in radioactive dating? 10. In radioactive dating, absolute age is determined by …. What property of radioactive potassium makes it useful for dating? 11. Why is potassium-argon dating is useful… In radiocarbon dating, what kind of atoms decay over time? 12. Carbon 14 dating works because, no additional ...... are added to plants or animals after they die. What is the half-life of Carbon 15? 13. Carbon 14 can’t be used to date ancient fossils because… What has destroyed or changed most of the early rocks that formed on the Earth? 14. Moon rocks were dated because… How does the age of the Moon and Earth compare? 15. If radioactive dating is correct, the moon’s age is….

Radioactive Decay Answer Blank
 * Igneous
 * Rate at which radioactive elements decay (half-life)
 * Decreases
 * 4.6 billion years old
 * Radioactive
 * Increases
 * Radioactive dating
 * Measuring the amount of radioactive parent element
 * Radioactive Decay
 * Measuring the amount of stable daughter element
 * Ratio of radioactive element to the stable element it decays into
 * It has a short half-life of about 5,000 years.
 * Long half-life
 * Carbon 14 atoms
 * Erosion due to weathering doesn’t happen on the Moon, so scientist wanted to infer the age of the Earth from them

Extensions not assigned yet: Explain a picture showing "half -life" and tell how "half-life relates to radioactive dating. (Just writing a definitions will earn few points. The point is to explain and relate the concepts.)

Radioactive Dating Activity https://www.acs.org/content/acs/en/education/whatischemistry/landmarks/radiocarbon-dating.html http://www.ted.com/talks/laura_robinson_the_secrets_i_find_on_the_mysterious_ocean_floor http://news.yahoo.com/dangerous-radioactive-material-stolen-mexico-031907112.html

[|Carbon Dating Explained]

[|Half Life] [|NASA eClips]