Which particle determines the name of the element you build

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

Which characteristics can be used to differentiate star systems? check all that apply.