The cause of your abdominal bloating and back pain may depend on which symptom came first. If back pain is your primary symptom, click here to read about the causes of back pain. If your primary symptom is abdominal bloating, read on.
The yields of the most massive elements produced in bombardments of target nuclei with heavy ions become extremely small with increasing atomic number, dropping to as little as one atom per week of bombardment for elements as massive as atomic number 112.
Problem #5: In a sample of 400 lithium atoms, it is found that 30 atoms are lithium-6 (6.015 g/mol) and 370 atoms are lithium-7 (7.016 g/mol). Calculate the average atomic mass of lithium. Problem #6: A sample of element X contains 100 atoms with a mass of 12.00 and 10 atoms with a mass of 14.00. Calculate the average atomic mass (in amu) of element X. The first way is the standard technique for solving this type of problem.