An atom contains one proton, one electron, and one neutron. which two particles are most similar in mass?

a. the neutron and the electron
b. the proton and the electron
c. the proton and the neutron
d. the neutron and the atom

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change. when the temperature in a room increases from 25°c to 33°c, changes from a solid to a liquid. in a lab, methane and nitrogen are cooled from -170°c to -200°c. the methane freezes and the nitrogen . when gold is heated to 2,856°c it changes from a liquid to a .

The identities of substances are the same before and after which type of change

Iwould appreciate if someone could me.