Multiple ChoiceApproximately how many times heavier is a helium (He) atom compared to a hydrogen (H) atom?57views
Multiple ChoiceIn the nuclear fission reaction n + 235U → 92Kr + 141Ba + 3n, which of the following is the atomic mass (x) of krypton (Kr) produced?30views
Multiple ChoiceChlorine has an atomic number of 17 and contains 18 neutrons. What is its mass number?56views
Multiple ChoiceWhich of the following is closest to the average atomic mass of phosphorus (P) as listed on the periodic table?53views