The half-life in years of Neptunium-237 which was the first isotope is 2.1  years.
 years.
 Neptunium is most stable and  Neptunium-237 is undergoes alpha decay, it means Neptunium-237 is decays by the emission of alpha particles . Seven alpha particles is emitted during decay of  Neptunium-237.  Neptunium-237 is radioactive actinide  elements and first  transuranium element.
The transuranium synthesis process involves creating a transuranium element through the transmutation process . The transmutation process  is the process of creating heavy elements from light elements. Hence the process is the transmutation of light elements. There are two types: artificial and natural transmutation.
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It would be sadness because people have been going thru alot of things over the years 
 
        
             
        
        
        
D, Neon and argon are both noble gases and contain almost the same elements.
 
        
             
        
        
        
Answer:
I'm so sorry if this is wrong but I think its B