1. The problem statement, all variables and given/known data atom traveling at 1.00% the speed of light has a KE of 2.016x10-16 kJ. Identify the element. 2. Relevant equations KE = .5mv^2 Hv= binding energy + KE 3. The attempt at a solution Ok. So I plugged into velocity and me to find my mass and got like 4.48E-26 g. So I tried to convert to grams/mol but it doesn't match with any of the elements on the periodic table... What do I do?