Lesser. atomic number means proton number
        
             
        
        
        
Answer:
(2R,3S)-2-ethoxy-3-methylpentane
and
(2S,3S)-2-ethoxy-3-methylpentane
Explanation:
For this case, we will have  
 as nucleophile. Also, this compound is also in excess. So, we will have as solvent 
 a protic solvent. Therefore the Sn1 reaction would be favored. 
The first step would be the carbocation formation followed by the attack of the nucleophile. In this case both isomers would be produced: R and S (see figure).
 
        
             
        
        
        
        
Manganese has 25 electrons and is a transition element