Question

exchange reactions of deutirium

Answer 1

Due to the acidic nature of α hydrogens they can be exchanged with deuterium by reaction with D2O (heavy water). The process is accelerated by the addition of an acid or base; an excess of D2O is required. The end result is the complete exchange of all α hydrogens with deuterium. 

Answer 2

deuterium-1H3
1 is atomic number
3 is atomic mass number