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