Question

which values do scientists compare when using potassium - argon dating?
o the number of stable and unstable parent atoms
o the number of non - decayed elements left in the rock
o the amount of parent and daughter material trapped in the rock
o the amount of gas from the decayed material that has escaped from rock

Explanation:

Potassium - argon dating is a radiometric dating method. In this method, scientists compare the number of non - decayed parent (potassium) atoms left in the rock. The decay of potassium (a radioactive isotope) to argon (a stable daughter product) occurs at a known rate. By measuring the amount of non - decayed potassium (non - decayed elements) and the amount of argon (daughter product) formed from the decay, they can calculate the age of the rock. The key factor is the number of non - decayed parent (potassium) atoms (non - decayed elements) as it relates to the decay process and the time elapsed since the rock formed.

Answer:

the number of non - decayed elements left in the rock