Pre-Lab FormativeRadiometric Dating LabThis is a modified true/false formative assessment. Each statement you read will be either true (T), or false (F). If true, simple write a T, if false, write an F, followed by the word or phrase which will correct the underlined portion of the sentence. Example:In order to accurately find an actual date for a substance, geologists use relative dating techniques.

Answer: F; radiometric

1. The radioactive isotope in a sample is known as the parent, while the stable element it breaks down into is the daughter.

2. The rate of decay is measured in units called half-lives, and it is the amount of time it takes for ½ of the daughter to evolve.

3. If the half-life of 226Ra is 1,500 years, and there are 10 grams of radium in the original sample, after 3,000 years, 5 grams or radium will remain.

4. When U-235 decays, units of protons and neutrons bound together are emitted from the nucleus in a process known as beta decay, which results in the formation of lead.

5. Radiocarbon dating uses the unstable 14C isotope, which decays to the stable 12C.

***BONUS***

Describe briefly why it would be impossible to determine the age of fossilized dinosaur bones using 14C method.