Geologic Time

Dating

100

Comparing the age of two things in terms of first/last.

relative dating

200

The age of something in years.

Absolute dating.

300

atoms of the same element with different numbers of neutrons

isotopes

400

The amount of time it takes for half of a radioactive sample to become stable.

half-life

500

Radioactive isotopes are known as ______ elements and the new, stable elements are known as _______.

parent, daughter