The student carried out three titrations. The results are shown below (pic) Use the student's concordant results (those within 0.10 cm of each other)
to work out the mean volume of sulfuric acid added.

Which of these is most likely a characteristic of a non-radioactive daughter isotope after it is formed from the parent isotope? 1) stable electrons 2) stable nucleus 3) positively charged atom 4) negatively charged atom