create an element
detect an element
split an element
irradiate an element
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When we know that half-life discuss the time at which element disintegrate and definitely When this happens new substance are formed! Just a matter of reasoning
The selected answer is wrong:
In three different past question booklet they say the knowledge of half life can be used to detect an element
The correct ans: A. As radioactive isotopes of elements decay, they lose their radioactivity and become a brand new element known as a daughter isotope
The knowledge of half-life can be used to detect an element with respect to its STABILITY. An element's stability can be Detected using the Proton to Neutron ratio, (P/N), which is a function of Half-life.
As we have seen, understanding how half-lives work has numerous practical applications, from determining when radioactive materials will become safe to figuring out effective drug dosages. Half-lives also show us that if we spend time learning something that changes quickly, we might be wasting our time. so the answer is B 100% correct any past question saying that it is to slit or create are all mad..! from beast in physics 
