There are four isotopes of lead and their relative abundance listed below.  use this information to calculate the approximate atomic mass of lead.  show all work   (4 points)                     82 protons, 122 neutrons, 1.4%                     82 protons, 125 neutrons, 22.1%                   82 protons, 124 neutrons, 24.1%                 82 protons, 126 neutrons, 52.4% show !

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.