An element has an atomic number of 43 and a mass number of 81. Using your determination as to whether it is proton or neutron rich, what is the atomic number of the element it becomes after radioactive decay?

Silicon (14 Si) has three stable isotopes with consecutive mass numbers. Write the complete nuclear symbol (with neutron number) for each. (Enter your answer in the form AZx_(N). Seperate substances in a list with a comma.)

What is the nuclear equation for decay for 237 Np 93

Natural uranium consists almost entirely of 238U. To operate a nuclear power reactor, the fuel must be enriched in a lighter fissionable isotope, 235U. If the average molar mass of uranium in a reactor is 236.2, what percent of the fuel consists of the lighter isotope? Assume that the masses of the two isotopes are exactly 235 and 238 amu.

Barium -142 would have how many neutrons in its nucleus