4 good questions and answers about "Dating - Video radioactive dating"

Each element has a unique and fixed number of ...
When is an atom called radioactive/unstable?
When an atom has an unequal number of protons and neutrons
What happens if an atom is unstable?
It breaks apart in a process called radioactive decay
If an element has a long half-life it decays relatively ... So it can only be used to date ...
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