Hi, help with these two questions. 1. Write the isotope notation for an atom with 9 protons and an atomic mass of 20.

2. Write the isotope notation for an atom with 13 protons and 12 neutrons.

Which of these conditions most likely produces an unstable isotope?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added