Concept radiometric dating
Radioactivity and radioactive decay are spontaneous processes.
In particular, they have a hard time understanding that different systems are appropriate for different types of radiometric dating and why.However, we generally refer to isotopes of a particular element (e.g., Rubidium-87 (Pb)).The number associated with an isotope is its atomic mass (i.e., protons plus neutrons).Statistical probablity is the only thing we can know exactly.Often students get bogged down in the fact that they don't "understand" how and why radioactive elements decay and miss the whole point of this exercise.
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