My 1st question: two different atoms have nine protons each and the same mass. however, one is neutral while the other has a positive charge. describe what each atomic structure could be, listing the possible number and location of all subatomic particles.

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3