Answer :
Final answer:
The decay of ruthenium-93 by positron emission results in technetium-93. This is because the atomic number of ruthenium decreases by one due to the conversion of a proton into a neutron in the process.
Explanation:
The question refers to the process of positron emission, which is a type of radioactive decay. In positron emission, a proton is converted into a neutron, which results in the atomic number of the atom decreasing by one. Given that ruthenium-93 is undergoing positron emission, its atomic number should decrease by one, yielding technetium-93. Therefore, the correct answer to this question is A. Technetium-93.
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