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If 50% of a radioactive element remains after 4000 years what is the half-life?

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...My god there are some idiots on here. 2000 years, because 50% is left. That is the definition of a half-life.

A half life in a particle is whenever it is half stable and half unstable, thus "Half-life"

^^ LOL. 

Thing is, clearly you are an idiot. 

The question is clearly saying it took 4000 years for the radioactive element to reach 50%. Meaning the half life of the element is 4000 years. Since a half life is when the element decays by 50% :) 

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