1. The problem statement, all variables and given/known data Americium-244 is a rare isotope of Americium. What is the mass defect of Americium-244? Use the following values for atomic and neutron masses when calculating your answer: 2. Relevant equations 3. The attempt at a solution This was what I did: Mass of protons = 95 x 1.007825 = 95.743375 Isotope = 149 x 1.008665 = 150.291085 Actual Mass Provided = 95.743375 + 150.291085 = 246.03446 Mass Defect = 246.03446 - 244.064279 = 1.970181 I've got that answer and its wrong. I also tried -1.97 and its still wrong. Can somebody please help me? Do i need to consider electron mass? I computed it to be: Mass Defect with electron mass = 244.064279 - (246.03446 + 0.052155) = 2.022336 which is - 2.022336. Is this correct?