An isotope of which element has a mass number of 111 and has 5 more neutrons
The Attempt at a Solution
I dont know where to start
The atomic numbers of the possible answers are 51 (Antimony, Sb), 48 (Cd), 53 (I), 50 (Sn), and 54 (Xe). Antimony-111 has a half-life of 75 seconds. Cadmium-111 is stable. Iodine-111 has a half life of 2.5 seconds. Tin-111 has a half-life of 35 minutes. Xenon-111 has a half-life of 0.74 seconds. So all of the possible answers have a possible mass number of 111.You give no reasoning but I think your answer has to be wrong on any possible guess of what the question is.