Incorrect Your answer is incorrect. - Row 1: Your answer is wrong. In addition to checking your math, check that you used the right data and DID NOT round any intermediate calculations. - Row 2: Your answer is incorrect. There are only two naturally-occuring stable isotopes of lithium, the masses of which are listed in the table below. Use whatever data you need from ALEK eriodic Table to calculate the natural abundance of each isotope and complete the table. 3e sure your answers have the correct number of significant digits. There are only two naturally-occuring stable isotopes of antimony. The mass and natural abundance of one of them is listed in the table below. Use whatever data you need from the ALEKS Periodic Table to determine the identity, mass and natural abundance of the other isotope, and complete the table. Be sure your answers have the correct number of significant digits