Analyze the role of positron emission in nuclear reactions and its implications for nuclear chemistry.

• A. Positron emission helps in understanding nuclear stability and transformations, indicating changes in atomic number and element identity.
• B. Positron emission is primarily used to increase the atomic number of an element.
• C. Positron emission has no significant role in nuclear reactions and does not affect nuclear chemistry.
• D. Positron emission only affects the mass number of an element, not the atomic number.

Answer: (A)