Answer:
Step-by-step explanation: Total atomic and mass numbers should be equal on both sides of the equation.
The atomic number of X=92-90 =2
The mass number of X=238-234 =4
Hence, it is an alpha particle.
It is a type of nuclear fusion, deuterium-tritium fusion. When one deuterium nucleus and tritium nucleus fuse, they create a helium nucleus and a free neutron. The reaction releases an energetic neutron.