Answer:
Since different isotopes of an element have different numbers of neutrons (but always the same number of protons) they have different mass numbers. Nitrogen-14 and nitrogen-15 are both stable isotopes of nitrogen. However, the other 5 isotopes are all unstable.
 
        
             
        
        
        
 The  compound NaH2PO4     name  is
sodium  dihydrogen  phosphate
  Explanation
This name is    arrived  at  by using the   IUPAC rules  of naming   compound
1.  the metal (sodium)is  named  first  followed  by  the ligand ( hydrogen  and phosphate)
Ligand  are  molecules   that are   attached to  the metal  center.
2.   ligand  are  named using alphabetical   order(for  our  case  h  for hydrogen come before p for  phosphate hence hydrogen is named first)
3. Prefix   di is used  since hydrogen  are two
hence the name  of the compound  is  Sodium dihydrogen  phosphate
        
             
        
        
        
Explanation:
the answer and the working out is shown above, hope it helps.